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Workmate.io

5.00 works with Waterfox G5.1.12 whereas 5.01 does not. 5.01 shows a spinning symbol when it is left clicked and gets no where, plus it won't install any scripts. I uninstalled 5.01 and installed 5.00 and could then install scripts and it all functions.

I had similar problems with a version I was using 7 years ago where that would not work at all. It's fine if you can find a version that actually works but not if you cannot. Auto updates could break the extension for some browsers even though it is supposed to be compatible.

The most recent update removed all my scripts! That's pretty damn disappointing.

Any Internet person who has walked the roads of the web long enough doesn't need this add-on recommended to them.

Very complete and quite powerful, what you can do with this is a complete game changer in your experience with your favorite websites.
From sites as old as Neopets to modernized ones like YouTube, the way you interact with many sites can be changed for the improvement of the user's quality of life.

Combined with specialized sites or a good user guide, anyone can install scripts (and even modify them) in a very simple and accessible way.

This is a tool that cannot be missing for a netizen. Obligated.