Things useful to “power users” that Firefox/PaleMoon/Waterfox browsers can offer (via extensions) that Edge and most others do not.
Tab Mix Plus 0.3.8.6 https://addons.mozilla.org/en-US/firefox/addon/tab-mix-plus
Reduce tab width; Enable multiple tab rows; Change how active tab looks, etc.
Memory Restart https://addons.mozilla.org/en-US/firefox/addon/memory-restart/
Shows how much ram FF is using, and enables easy restart to flush memory.
ColorfulTabs https://addons.mozilla.org/en-US/firefox/addon/colorfultabs/?src=search/
Make tabs distinctive. Options to change per site, etc.
FindBar Tweak https://addons.mozilla.org/en-US/firefox/addon/findbar-tweak/
Save search across pages. Keep search box open, etc.
Session Manager 0.7.5 https://addons.mozilla.org/en-US/firefox/addon/session-manager/
Save sessions
Count word professional.https://addons.mozilla.org/en-us/firefox/addon/count-word-professional/
Select text and see how many characters and words. Useful for forums.
Menu Editor http://menueditor.mozdev.org/
Change items in menus
Googlebarlite https://addons.mozilla.org/firefox/downloads/latest/492/addon-492-latest.xpi?src=search
More options and customizations than Google Toolbar
Send Tab URLs https://addons.mozilla.org/en-US/firefox/addon/send-tab-urls/?src=ss
Copy and send list of all open tabs URLs.
Copy as HTML Link https://addons.mozilla.org/en-US/firefox/addon/copy-as-html-link/?src=search
R. click and Copy as HTML Link
Google/Yandex search link fix https://addons.mozilla.org/en-US/firefox/addon/google-search-link-fix/
The actual URL is copied.
BBCodeXtra https://addons.mozilla.org/en-US/firefox/addon/bbcodextra/
An extension which adds to the context menu new commands to insert BBCode/Html/XHtml codes in an easy and fast way...
Very useful for FR.
Lazarus: Form Recovery https://addons.mozilla.org/en-us/firefox/addon/lazarus-form-recovery/
Saved text of comboxes. Has saved me loosing much typing after crashes.
Converter https://addons.mozilla.org/en-US/firefox/addon/converter/
Right click on metric sizes and convert to standard. Also for currency.
FlashGot https://addons.mozilla.org/en-US/firefox/addon/flashgot/?src=search
Google-translator-for-firefox/ https://addons.mozilla.org/en-Us/firefox/addon/google-translator-for-firefox/
FT DeepDark https://addons.mozilla.org/en-US/firefox/addon/ft-deepdark/
Best theme i found.
Noiascrollbars https://addons.mozilla.org/en-US/firefox/addon/noiascrollbars
A work of beauty and far better visibility,. .
Classic Theme Restorer https://addons.mozilla.org/en-US/firefox/addon/classicthemerestorer/
Options.
stay-Open Menu https://addons.mozilla.org/en-US/firefox/addon/stay-open-menu/
Opens Bookmarks in tabs without losing the menu.
Xmarks Sync https://addons.mozilla.org/en-US/firefox/addon/xmarks-sync/?src=search