Below are some of our favorite Firefox hacks, tweaks, and productivity enhancements that can be done via Configuration Editor (about:config page) and by installing third-party extensions (add-ons for Firefox).
media.peerconnection.enabled => false
Firefox already has an Enhanced Tracking Protection feature that blocks a list of known "fingerprinters" when your privacy settings are set to Standard (the default) or Strict, whereas Fingerprinting Protection is a different, experimental feature under heavy development in Firefox.
privacy.resistFingerprinting => true
privacy.trackingprotection.fingerprinting.enabled => true
Enable IDN Punycode (display the "raw", punycode version of internationalized domain names).
network.IDN_show_punycode => true
Enable Container Tabs and its UI setting. Firefox containers let you separate your browsing activities into color-coded tabs for banking, work and personal browsing. This allows you to always open new tabs in containers of your choosing for a more private browsing experience. Each container is isolated from the others, so you can access sites logged into different accounts.
privacy.userContext.enabled => true
privacy.userContext.ui.enabled => true
privacy.userContext.newTabContainerOnLeftClick.enabled => true
Disable Geolocation Tracking.
geo.enabled => false
Disables the Widevine Content Decryption Module provided by Google.
media.gmp-widevinecdm.enabled => false
Disable Pocket integration.
extensions.pocket.enabled => false
This is the data submission master kill switch (if disabled, no policy is shown or upload takes place).
datareporting.policy.dataSubmissionEnabled => false
Disable recommendations in about:addons' Extensions and Themes panes.
extensions.htmlaboutaddons.recommendations.enabled => false
Web pages won't be allowed to manipulate or block the context menu.
dom.event.contextmenu.enabled => false
Prevent scripts from moving and resizing open windows.
dom.disable_window_move_resize => false
For anyone wishing to maximize the amount of space available for web content in their browser, Firefox offers a useful "Compact density" option, which reduces the size of the user interface. However, starting with Firefox 89, this option is hidden by default. The following settings will help you get this option back.
browser.compactmode.show => true
Next step: More tools -> Customize toolbar... -> Density -> Compact (not supported).
Open bookmarks in a new tab (rather than existing window).
browser.tabs.loadBookmarksInTabs => true
Prevent Firefox from exiting when you close the last tab.
browser.tabs.closeWindowWithLastTab => false
This preference controls whether lines in View Source that are too long to fit the window will wrap to the next line or cause a horizontal scroll bar.
view_source.wrap_long_lines => true
Color management allows images and colors to be displayed consistently across a variety of devices. Firefox recognizes embedded ICC profiles in image files and uses a local color profile to perform the color adjustments.
Color correction can be controlled by setting the value of the gfx.color_management.mode preference, as follows:
0 -> Disable color management
1 -> Enable color management for rendered graphics
2 -> Enable color management for tagged graphics only (Default)
Full color management means that everything rendered by Firefox, with the exception of plugins, has its colors corrected.
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uBlock Origin (uBO) is a free and open-source browser extension for content filtering, including ad blocking. Out of the box, uBO blocks ads, trackers, coin miners, popups, etc.
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Facebook Container works by isolating your Facebook identity into a separate container that makes it harder for Facebook to track your visits to other websites with third-party cookies.
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DuckDuckGo Privacy Essentials provides simple and seamless privacy protection for your browser: tracker blocking, cookie protection, DuckDuckGo private search, email protection, HTTPS upgrading, and much more.
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SingleFile is an add-on for Firefox Desktop and Mobile that helps you to save an entire webpage including images, styling, frames, fonts etc. as a single HTML file.