When I'm not using Opera, I occasionally use Firefox / Pale Moon and was wondering what plugins apart from the usual ones (Adblock Plus, Greasemonkey, Stylish, etc.) you find useful.
Here are some of my favorites:BarTab:https://addons.mozilla.org/en-us/firefox/addon/bartab/
For me, this is the most handy Firefox plugin next to TabGroups Manager.
If you're a power surfer like me who opens more than a dozen tabs at a time, BarTab will only load the active tab and not the other ones. This incredibly saves memory and loading times considerably.
For Opera, the author of the popular extension, TabVault, is looking to add similar functionality in a future version.TabGroups Manager:https://addons.mozilla.org/en-US/firefo ... s-manager/
tab groups management to Firefox. I wish something like this was in Opera. For now, I'll have to manage with Opera's TabVault extension.PlacesCleaner:https://addons.mozilla.org/en-us/firefo ... escleaner/
Your history database can grow at alarming rates! PlacesCleaner helps to remove websites you rarely visit and reduces the filesize of your history database accordingly. Again, Opera could use something like this. (Check out the /vps/ folder in Opera and you'll know what I mean.)