I loaded Firefox in the beginning, used it for a bit then had issues so I removed the program. I tried to load Firefox again, getting a newer version, and now in “Add-ons” I get an error message that I need to install ref control, which I have (and it shows up in “Add-ons” and is enabled). I also get a message that XUL Cache 1.0 isn't compatible with Firefox 8.0. So now my question: how do I fix this problem, and where do I change or update my XUL Cache 1.0 to a working program?
Sometimes it happens if add-on makers don't upgrade as fast as Firefox.
I have a round-about way:
1) download the xpi (just open in any other browser if installing from addons-dot-mozilla[-dot-com
2) open the xpi, in that there is install.rdf
3) search for tags
4) change the values to fit in your version. Cheers :)