Here are some FF extensions whomst I use, and most likely to appeal to a wide variety of weird Elsewherians.
Book Finder
“Add links to other bookstores on Amazon product pages.”
Bookmark Dupes
Helps find and delete duplicate bookmarks.
Close Tab History Button
Click the icon, and a smol drop down menu shows you the last ten tabs you’ve closed.
De-Troll YouTube - Hide Unwanted Commenters
Puts a cute little trashcan icon near all usernames, and when it’s clicked, you’ll never see their stupid names, avatars, nor comments ever again!
{Just reload the page if the trashcans are absent}
Disable Youtube comments
“Protect your sanity by disabling comments on any youtube video.” OMG so helpful.
FoxyTab
A host of tab-related goodies in a lickle drop down menu. I most frequently avail meself of the
Copy ⇨ Tab Title {!!!}
and
Copy ⇨ Tab URL
features.
Kill Infinite Scroll
Does what it says on the tin at lotsa websites.
Kill It
Rather limited scope, but often comes thru when other adblockers don’t.
Reload Skip Cache Button
The author, Button Guy, made all kindsa useful FF buttons for functions what FF lacked. He used to have a massive pkg of buttons, and you could pick out all the ones you wanted, and drop 'em on any menu bar. I’ve been using various buttons of his for decades.
Return YouTube Dislike
Doesn’t work only when vid creators disable the dislike function.
RYS — Remove YouTube Suggestions
The annoying right hand column is gone, also 65+ additional yt customization options.
Selective Bookmarks Export Tool
Ever wanna export not all yr bookmarks? Here’s yr helpful beast.
Stop All Button
Another good 'un from Button Guy. “Stop all tabs from loading when you have mass opened tabs and found the one you really wanted.” It’s only b0rked when FF is also b0rked, like if FF is frozen or crashing.
Tab List Button
Button Guy provides a list of every tab what you’ve got open.
Timer
“Stylish timer combined with stopwatch and alarm for your browser.” You can choose yr alarm noise from several good ones.
Tranquility Reader
Makes pages actually legible - removes all gobbledegook.
uBlacklist
“Blocks sites you specify from appearing in Google search results.” Never see those Asian pr0n or spam keyword sites again when asking Gogol for not those things. I love this one so much.
Unhook: Remove YouTube Recommended Videos Comments
“Hide YouTube related videos, comments, video suggestions wall, homepage recommendations, trending tab, and other distractions.” So very useful!
This updated version is not available to me b/c legacy FF, b/c yet again, archaic retired school laptop.
Hope someone finds these helpful.