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I've used this add-on for years, but it seems that it hasn't been updated since 2009, which makes browser compatibility problematic.

For what I use it for it works just fine, but it seems many can't use it because the max version is too low, & it does not install in the latest versions of FireFox.

Well, if you're courageous there is a fix.
You can change the max version yourself to make it acceptable to your newest version of FireFox.

WARNING: This will not fix any actual incompatibility issues with the browser itself, it merely causes the browser to accept the add-on as usable in regards to the browsers compatibility check.

The fix is located here:

http://kb.mozillazine.org/Editing_an_add-on_to_change_its_compatibility

Now like I said, it won't fix the file...it just makes it acceptable regarding version compatibility checks.

Good Luck!