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Mozilla finally added an environment variable to control this behavior. Unfortunately, configuring this environment variable in a way that applies to the overall graphical system, rather than merely a bash session, is a bit difficult. This used to be done via /etc/launchd.conf, but macOS dropped support for this in v10.10. Fortunately, systemctl offers a .plist file system which can define run programs and define system-wide environment variables at boot, so I published this working .plist file, with instructions for installing and removing it:

https://github.com/mcandre/dotfiles/blob/master/setenv.MOZ_DISABLE_SAFE_MODE_KEY.plist

This is awesome for me, because I like to launch my web browser from anywhere in the GUI with Control+Alt+G via QuickSilver, which of course includes the Alt modifier that Firefox tends to interpret as signaling safe mode.

Советник замечает, когда вы открываете страницы определённых товаров и услуг. В такие моменты он начинает искать их в интернете, выбирает предложения с меньшей ценой и тут же показывает их вам.

Actually, you might be in luck! If you want to style a tab according to the domain, the TAB element has an attribute called IMAGE which is the URL for the Favicon it displays. If the website has a favicon then you can do this:

@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);
tab[image*="example.com"] {background:red !important;}

certainlyakey starred Smile4ever/firefoxaddons

Explore the deepest secrets of the ocean with some of Firefox Developer Edition 44’s newest tools, designed to take the pain out of CSS animation.

Displays tabs in tiled layouts in Firefox. Arrange tiles horizontally, vertically or in a grid. Resize tiles by dragging splitter bars. Tabs and links can be dragged to open in other tiles. Supports multiple tiled layouts. Works with tab groups.

Between simple tweaks such as placing the findbar in the top corner, to the powerful "Find in All Tabs" tool, it has everything to make the Find Toolbar a powerful and accessible research tool!

Adds "Open Link" menu to force links to open in current tab.

Use filename templates to quickly (or automatically) save web pages/images/links/selected text to pre-defined folders.

Changes link clicking behavior when using modifier keys or middle mouse button.

Allows one to view and copy the anchors on a web page. The addon is an updated version of "Show Anchors" by PCDingo which is no longer maintained. Please uninstall "Show Anchors" first.

You can copy any URL on Mouse Over. Which helps you to copy the urls very quickly.

Allows searching, sorting and saving of cache files.
This is a custom upgrade for Firefox of the original CacheViewer add-on by benki.
New features have been added.

Преобразует в ссылки сегменты URL в адресной строке. Форк Locationbar² и Locationbar³ с исправлениями ошибок. Включает поддержку международных доменных имён IDN и возможность перехода на домен или субдомен.

Connects a text area or js code editor to an editor with GhostText server installed, all text changes will be send from the editor to the browser and vice versa.

Menu Wizard - это дополнение к браузеру Firefox, которое поможет вам настроить меню: удаление, перемещение и переименование. Так же поддерживается SeaMonkey и Thunderbird.

Return focus from embedded object back to browser on browser hotkeys pressed.

ArchView can open archive file online without downloading the whole archive. Just like normal web pages. It is very fast since it merely fetches a small portion of the archive file from server. ArchView supports RAR, ZIP formats and ISO CD image; HTTP, FTP and file: protocols. And it can present XUL or HTML interface.
Old version here https://addons.mozilla.org/en-US/firefox/addon/archview/?src=search

Suspends background old tabs automatically to save memory usage.