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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2017-01-30 from rev ccaa2f364422+.

Firefox.

How edit settings?

Default settings stored in 'prefs.js'. If you don't want rewrite it edit/create 'user.js':

$ emacs ~/.mozilla/firefox/xxxxxxx.default/user.js

or open link:

about:config

See

http://www.mozilla.org/unix/customizing.html#prefs

Profiles.

How create new profile.

Close all opened firefox windows (File -> Exit)! And run:

$ firefox -P

and in GUI push "Create profile" button and type profile name.

How to add old profile.

Locate profile config file:

c:/Users/%USERNAME%/AppData/Roaming/Mozilla/Firefox/profiles.ini

and add entry:

[Profile1]
Name=test
IsRelative=0
Path=E:\home\.firefox

You must edit Profile1 and Path lines.

How run two firefox simultaneously.

$ firefox             # run firefox with default profile
$ firefox -P second-profile-name -no-remote
$ firefox -P third-profile-name -no-remote

https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options
  Firefox command line options.

How backup and restore profile.

Just save content of '~/.mozilla/firefox/Profiles/xxxxxxx.default'. To restore profile edit '~/.mozilla/firefox/profiles.ini':

[Profile<N>]
Name=default
IsRelative=1
Path=Profiles/xxxxxxx.default
Default=1

Change user agent.

general.useragent.override

For Debian Icewasel just remove Icewasel from user agent string. Example:

Mozilla/5.0 (X11; Linux x86_64; rv:44.0) Firefox/44.0

How limit simultaneously connection counts?

network.http.max-connections - 4

or search by word 'connections' in 'about:config'.

See:

http://kb.mozillazine.org/Network.http.max-connections

Firefox downloading.

ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/
Download older version.

Privacy.

See

http://www.mozilla.com/en-US/privacy-policy.html http://www.mozilla.com/en-US/legal/privacy/firefox-en.html

Do not send anything through Breakpad.

Breakpad is crash report library. If firefox crash Breakpad can send core file to Mozilla.

The breakpad report server linked to in about:crashes (you can see which and where report you send).

breakpad.reportURL is URL where send report. Set it to http://localhost to not send report.

http://kb.mozillazine.org/Breakpad.reportURL

Be careful with "Automated Update Service".

It can be disabled through "Tools -> Advanced -> Update".

Disable "Location-aware Feature".

Beginning with Firefox 3.5, Firefox offers a Location-Aware Feature, parts of which may be provided by third party service providers.

To disable Location-aware Feature set "geo.enabled" to "false".

Per site permission can accesssed through "Navigate to the site" -> "Tools" menu -> "Page Info" -> "Permissions tab" -> "Share Location".

See

http://www.mozilla.com/en-US/firefox/geolocation/

Disable Google safe browsing.

It can be disabled through "Tools -> Options -> Security tab", untick the checkboxes for attacks and forgeries.

Set

browser.safebrowsing.enabled "false"
do not use safebrowsing
browser.safebrowsing.malware.enabled "false"
do not download malware blacklists and do not check downloads
browser.safebrowsing.remoteLookups "false"
use local blacklist to determine a site's phishiness instead submitting the URL to a third party (deprecated?)

See

http://kb.mozillazine.org/Browser.safebrowsing.enabled http://kb.mozillazine.org/Browser.safebrowsing.remoteLookups

View_source.

view_source.wrap_long_lines
True - HTML code will wrap in the view source window, false (default).
view_source.syntax_highlight
True (default) - enable syntax highlighting in the view source window. "View → Syntax Highlighting".

Privacy.

privacy.item.cache
True (default) - clear the cache when using the Clear Private Data feature (Firefox 1.5 and above only). This can be changed via "Tools → Options → Privacy → Settings..." (Firefox 1.5) or "Tools → Options → Privacy / Private Data → Settings..." (Firefox 2.0 and above).
privacy.item.cookies
True - delete all cookies when using the Clear Private Data feature (Firefox 1.5 and above only). This can be changed via "Tools → Options → Privacy → Settings..." (Firefox 1.5) or "Tools → Options → Privacy / Private Data → Settings..." (Firefox 2.0 and above).
privacy.item.downloads
True (default) - clear history of downloaded files when using the Clear Private Data feature (Firefox 1.5 and above only). Note: This can be changed via "Tools → Options → Privacy → Settings..." (Firefox 1.5) or "Tools → Options → Privacy / Private Data → Settings..." (Firefox 2.0 and above).
privacy.item.formdata
True (default) - clear all saved form data when using the Clear Private Data feature (Firefox 1.5 and above only). This can be changed via "Tools → Options → Privacy → Settings..." (Firefox 1.5) or "Tools → Options → Privacy / Private Data → Settings..." (Firefox 2.0 and above).
privacy.item.history
True (default) - clear the browsing history when using the Clear Private Data feature (Firefox 1.5 and above only). This can be changed via "Tools → Options → Privacy → Settings..." (Firefox 1.5) or "Tools → Options → Privacy / Private Data → Settings..." (Firefox 2.0 and above).
privacy.item.offlineApps
True - clear the offline website data when using the Clear Private Data feature (Firefox 3 and above only). This can be changed via "Tools → Options → Privacy / Private Data → Settings...".
privacy.item.passwords
True - delete all saved passwords when using the Clear Private Data feature (Firefox 1.5 and above only). This can be changed via "Tools → Options → Privacy → Settings..." (Firefox 1.5) or "Tools → Options → Privacy / Private Data → Settings..." (Firefox 2.0 and above).
privacy.item.sessions
True (default) - clear all authenticated SSL sessions when using the Clear Private Data feature (Firefox 1.5 and above only). This can be changed via "Tools → Options → Privacy → Settings..." (Firefox 1.5) or "Tools → Options → Privacy / Private Data → Settings..." (Firefox 2.0 and above).
privacy.popups.firstTime
True (default) - the user has never hidden the popup blocker notification bar before, so show a dialog explaining the status bar icon. False - the user has been informed of the status bar icon.
privacy.popups.policy
Determines the popup blocker behavior. 1 - allow popups, 2 - reject popups. Seems to be deprecated in favor of dom.disable_open_during_load.
privacy.popups.showBrowserMessage
True (default) - display a message at the top of the browser window when a popup has been blocked. False - display a status bar icon to indicate when a popup has been blocked.
privacy.sanitize.promptOnSanitize
True (default) - prompt before performing the Clear Private Data operation (Firefox 1.5 and above only) In Firefox 1.5 and above, this can be changed via "Tools → Options → Privacy → Settings...".
privacy.sanitize.sanitizeOnShutdown
True: Perform the Clear Private Data operation when closing the browser (Firefox 1.5 and above only). Note: In Firefox 1.5 and above, this can be changed via "Tools → Options → Privacy → Settings..."

Security.

security.warn_entering_secure
True (default) - display a dialog warning the user when entering a secure site from an insecure one.
security.warn_entering_secure.show_once
True (default) - Leave the "Alert me whenever..." box unchecked on the security warning dialog.
security.warn_entering_weak
True (default) - display a dialog warning the user when entering an insecure site from a secure one.
security.warn_entering_weak.show_once
True (default) - leave the "Alert me whenever..." box unchecked on the security warning dialog.
security.warn_leaving_secure
True (default) - display a dialog warning the user when leaving a secure site.
security.warn_leaving_secure.show_once
True (default) - leave the "Alert me whenever..." box unchecked on the security warning dialog.
security.warn_submit_insecure
True (default) - display a dialog warning the user when submitting a form to an insecure site.
security.warn_submit_insecure.show_once
True (default) - leave the "Alert me whenever..." box unchecked on the security warning dialog.
security.warn_viewing_mixed
True (default) - display a dialog warning the user when a page has both encrypted and non-encrypted content.
security.warn_viewing_mixed.show_once
True (default) - leave the "Alert me whenever..." box unchecked on the security warning dialog.
security.xpconnect.plugin.unrestricted
True (default) - allow scripting of plugins by untrusted scripts.

Signon.

signon.prefillForms
True (default) - allows auto-filling of stored usernames and passwords on webpage forms.
signon.rememberSignons
True (default) - enable the Password Manager.

JavaScript.

javascript.enabled (Boolean).
Set this to true should you desire support for JavaScript. The same as the Enable JavaScript option in the Content tab.
dom.allow_scripts_to_close_windows (Boolean).
Setting this to true specifies that any window may be closed and isn’t recommended. Entering false specifies that only windows opened by script can be closed via close().
dom.disable_image_src_set (Boolean).
This option determines whether JavaScript is allowed to change images. Set this to true to enable this feature and false to disable it (recommended).
dom.disable_open_click_delay (Integer).
This option specifies the amount of time, in milliseconds, that must be surpassed before a pop-up window created by JavaScript setInterval() or setTimeout() calls aren’t managed by current pop-up blocker settings. Beneath this threshold existing pop-up blocker settings are applied. Default is 1000 (1 second).
dom.disable_open_during_load (Boolean).
Set this to true to enable Firefox’s built-in pop-up blocker, which disables the loading of much pop-up content on sites – which will mostly be advertisements (it’s worth noting this is not perfect and will also disable many legitimate pop-ups). Should a pop-up be blocked in this way an information bar will appear at the top of the window, from which you can select what action to take. Setting this to false disables the pop-up blocker (Not recommended). Note – This is the same as the Block pop-up windows option in the Options menu, Content tab.
dom.disable_window_flip (Boolean).
This option controls whether JavaScript may be used to bring windows into the foreground/background via focus(). Setting this to true disables such actions, which won’t affect new pop-ups from loading in the foreground, though can force existing ones to remain in the background unless switched to manually. Set this to false to allow the script to determine what happens. Note – This is the same as the Raise or lower windows option in Advanced JavaScript Settings.
dom.disable_window_move_resize (Boolean).
This option controls whether JavaScript can be used to move &/or resize windows, whereby setting this to false enables scripts to do this. It would perhaps be best to set this to true, allowing only yourself to resize/move windows. Note – This is the same as the Move or resize existing windows option in Advanced JavaScript Settings.
dom.disable_window_open_feature.close (Boolean).
Set this to false to enable the use of scripting to hide the close button of windows, true forces the close button to always be displayed (recommended).
dom.disable_window_open_feature.directories (Boolean).
Set this to false to enable the use of scripting to hide the bookmarks toolbar, true prevents the bookmarks toolbar from being hidden in this way.
dom.disable_window_open_feature.location (Boolean).
Set this to false to enable the use of scripting to hide the Location (Address) bar, true prevents the Address bar from being hidden.
dom.disable_window_open_feature.menubar (Boolean).
Set this to false to enable the use of scripting to hide the Menu bar, true disables the hiding of the Menu bar.
dom.disable_window_open_feature.minimizable (Boolean).
Set this to false to enable the use of scripting to disable the minimizing of windows, true enables the minimizing of such windows (recommended).
dom.disable_window_open_feature.resizable (Boolean).
Set this to true to enable the use of scripting to hide the close button of windows, false forces the close button to always be displayed (recommended).
dom.disable_window_open_feature.scrollbar (Boolean).
Set this to false to enable the use of scripting to hide the Scroll bar in windows, true disables the hiding of the Scroll bar in windows.
dom.disable_window_open_feature.status (Boolean).
This option controls whether JavaScript can be used to hide the status bar, whereby setting this to false enables scripts to do this. Set this to true to force the status bar to be displayed at all times. Note – This is the same as the Hide the status bar option in Advanced JavaScript Settings.
dom.disable_window_open_feature.titlebar (Boolean).
Set this to false to enable the use of scripting to hide the Title bar of windows, true forces the Title bar to always be displayed.
dom.disable_window_open_feature.toolbar (Boolean).
Set this to false to enable the use of scripting to hide the Navigation toolbar, i.e. Back, Forward, etc. buttons, false prevents the hiding of the Navigation toolbar.
dom.disable_window_status_change (Boolean).
This option controls whether JavaScript can be used to display custom text in the status bar, e.g. moving the mouse over a hyperlink normally would display where the link points to, though a script could be used to display something else instead. Set this to false to allow such custom status bar text displayed, while true will disable this. Note – This is the same as the Change status bar text option in Advanced JavaScript Settings.
dom.event.contextmenu.enabled (Boolean).
This option controls whether JavaScript can be used to alter, or even disable the context menu, e.g. right clicking could be disabled on certain pages. Set this to true if you wish to allow sites to be able to do this, while false ensures scripts can’t be used to alter this functionality. Note – This is the same as the Disable or replace context menus option in Advanced JavaScript Settings.
dom.max_script_run_time (Integer).
This specifies the amount of time, in seconds, that a script in content may run before being prompted whether to continue running it or not (default 10). Setting to 0 allows scripts to run as long as required.
dom.max_chrome_script_run_time (Integer).
This specifies the amount the amount of time, in seconds, that a script with chrome privileges may run before being prompted whether to continue running it or not (default 20).
dom.popup_maximum (Integer).
This value specifies the maximum number of pop-up windows that may be open simultaneously (default 20).

See

http://kb.mozillazine.org/Dom.max_script_run_time http://kb.mozillazine.org/Dom.max_chrome_script_run_time

Plugin.

plugin.default_plugin_disabled
True (default) - when a plugin is needed, prompt the user. False - don't prompt the user to install needed plugins.
plugin.expose_full_path
True - in about:plugins and navigator.plugins, reveal the full path to plugin files. False (default) - show only the plugin filename

Download Manager.

browser.download.manager.flashCount
Set to 0 to stop flashing Download Manager.
browser.download.manager.showAlertOnComplete
Set to false to top flashing alter on complete download.
browser.download.manager.retention
Clear immediately the download history: 0 - upon successful download 1 - when the Firefox browser closes 2 - needs user to clear it manually (default)
browser.download.manager.closeWhenDone
Set to false to stop Firefox closing Download Manager when download is complete.
browser.download.manager.scanWhenDone
Set to false to stop scaning for viruses.

Useful user plugin.

Adblock Plus.

Block from loading ads and banners.

http://adblockplus.org/en/
home page
https://addons.mozilla.org/en-US/firefox/addon/4364
official mozilla download place

NoScript.

Add-on allows JavaScript, Java and Flash and other plugins to be executed only by trusted web sites of your choice (e.g. your online bank), and provides the most powerful Anti-XSS protection available in a browser.

http://noscript.net/
home page

FlashGot.

The best Firefox download manager integration.

http://flashgot.net
home page

GreaseMonkey.

Allows you to customize the way a webpage displays using small bits of JavaScript.

http://www.greasespot.net
Home page.
https://addons.mozilla.org/firefox/748
Download page.
https://greasyfork.org/scripts/1317-download-youtube-videos-as-mp4
Download YouTube Videos as MP4.

How to disable GZIP compression in Firefox?

user_pref("network.http.accept-encoding", ""); // default - "gzip,deflate".

Restart the Firefox in Safe Mode.

Poorly designed or incompatible extensions can cause problems with your browser, including make it crash, slow down page display, etc:

$ firefox -safe-mode

Hot calc by Firefox.

At URI type some thing like "javascript: 4+5"

Disable safe browsing.

user_pref("browser.safebrowsing.enabled", false);
user_pref("browser.safebrowsing.malware.enabled", false);
user_pref("services.sync.prefs.sync.browser.safebrowsing.enabled", false);
user_pref("services.sync.prefs.sync.browser.safebrowsing.malware.enabled;false", false);

Disable geo location.

user_pref("geo.enabled", false);

You can fake your location by JSON like:

{"location":{"latitude":48.861426,2.338929,"longitude":2.338929, "accuracy":20.0}}

in file pointed by:

user_pref("geo.wifi.uri", "file:///home/user/fake-geo.json");