Tap here to go to the mobile version of the site.
Your Firefox is out of date and may contain a security risk! Upgrade Firefox

Support Forum

Just got Firefox version 17.Every add on I try to load comes back with cannot download, not compatable with version 17


ASUS TF300 Andriod 4.1 Firefox 17. .

Additional System Details


  • User Agent: Mozilla/5.0 (Windows NT 5.1; rv:18.0) Gecko/20100101 Firefox/18.0

More Information

  • Top 10 Contributor
415 solutions 4924 answers

This can be caused by one of files that contain details of installed extensions becoming corrupted.

Close Firefox, go to your profile folder and delete extensions.cache, extensions.ini and extensions.rdf

Next open the extensions sub-folder within your profile folder, if there is a folder called staged-xpis delete it.

Firefox > Exit and reopen it.

  • Top 10 Contributor
  • Moderator
10751 solutions 96757 answers

Is this about installing extensions on Firefox Mobile?

Did you spoof the user agent to get desktop pages?

If this is the case then you may have to disable this temporarily to be able to install extensions for mobile.