• ui.key.generalAccessKey;18

  • Don’t use shift-alt-<key>, but only use alt-<key> for accesskeys. Removes the feature for using alt-<key> for opening the main browser menus.
• accessibility.typeaheadfind.timeout;0
• accessibility.typeaheadfind.casesensitive;-1

• browser.allTabs.previews;false

  • The top-right button to view history as screenshots. Ugh.

• browser.cache.disk_cache_ssl;false

  • Holy fuck, the default is insecure! Did the NSA pay Mozilla for this default?

• browser.ctrlTab.previews;false

  • Fucking ugly control-tab popup nonsense.
  • Allows control-shift-tab to switch to the previous tab.

• browser.display.force_inline_alttext;true

  • Force ALT text for missing images to be layed out inline.

• browser.display.use_focus_colors;true

  • browser.display.focus_background_color;#FFCC99
  • browser.display.focus_text_color;#000000

• browser.download.manager.addToRecentDocs;false

  • Privacy.
• browser.download.manager.flashCount;0
• browser.download.manager.quitBehavior;1
• browser.download.manager.showAlertOnComplete;false

• browser.fixup.alternate.enabled;false

  • Don’t add www. or .com

• browser.newtab.url;about:blank

  • Do not display the table of images of recently-visited websites. Do not display anything when opening a new tab.
  • FIXME – This does not remove the logging of that functionality. Because fuck the user.
• browser.panorama.animate_zoom;false

• browser.safebrowsing.enabled;false

  • Privacy.
• browser.sessionstore.max_concurrent_tabs;0

• browser.sessionstore.max_tabs_undo;4

  • Save memory by limiting the maximum number of closed tabs which can be un-closed.
  • This probably isn’t significant, but remember that each tab has its own browsing history and perhaps other data like text entered into web forms.

• browser.sessionstore.restore_pinned_tabs_on_demand;true

  • On startup, don’t immediately download and render the content for pinned tabs until they are selected.
• browser.tabs.animate;false
• browser.tabs.closeWindowWithLastTab;false
• browser.tabs.closeButtons;2
• browser.tabs.loadBookmarksInBackground;true
• browser.tabs.selectOwnerOnClose;false
• browser.zoom.siteSpecific;false

• config.trim_on_minimize;true

  • Windows-only, upon minimize, dump the memory Firefox uses to the swap file.
  • I don’t recommend this under typical circumstances.

• dom.popup_allowed_events;

  • Empty that field.

• geo.enabled;false

  • Privacy

• gfx.downloadable_fonts.enabled;false

  • See https://wiki.mozilla.org/Firefox3.1/Downloadable_Fonts_Security_Review
  • See Firefox shows little boxes in Twitter and WordPress
  • Privacy.
  • gfx.downloadable_fonts.same-site-origin.enabled;true
  • I’m not certain this is valid, but I’ll add it and see how it goes.
• browser.backspace_action;0

• dom.vibrator.enabled;false

  • Feature creep.

• NO LONGER USED – full-screen-api.enabled;false

  • No, internet content must not have control over my window.
  • YouTube video fullscreen relies on this.

• dom.disable_window_move_resize;true

  • No, internet content must not have control over my window.

• dom.disable_window_open_feature.menubar;true

  • No, internet content must not have control over my browser’s UI elements.

• dom.disable_window_open_feature.personalbar;true

  • websites can’tremove the personalbar from the browser with javascript

• dom.disable_window_open_feature.titlebar;true

  • websites can’t remove the titlebar from the browser with javascript

• dom.disable_window_open_feature.scrollbars;true

  • No, internet content must not have control over my browser’s UI elements.

• dom.disable_window_open_feature.toolbar;true

  • No, internet content must not have control over my browser’s UI elements.

• javascript.options.showInConsole;false

  • Bloat.
• layout.spellcheckDefault;2

• middlemouse.contentLoadURL;false

  • Privacy. I keep middle-clicking slightly off a valid area and the browser will start searching with that content. Eww.

• middlemouse.paste;true

  • Paste with the middle mouse click. The default on Linux, but not on Windows.

• mousewheel.withaltkey.action;1

  • This sets scrolling “by page”, but the definition of “page” must still be defined..
  • mousewheel.with_alt.delta_multiplier_y;1000
• nglayout.enable_drag_images;false
• security.dialog_enable_delay;10

• signon.autofillForms;false

  • Security.

—

• If you use a GStreamer plugin, media.gstreamer.enabled;true

• browser.taskbar.previews.cachetime;0

  • Unsure, but I don’t think I want it.

• browser.taskbar.previews.max;0

  • Unsure, but I don’t think I want it.

• html5.enable;true

Correctly-set by default:

• dom.battery.enabled;false

  • Feature creep.

• layout.css.report_errors;false

  • Bloat.

• svg.enabled;true

  • Doesn’t have an entry, on by default.