Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Since installing Firefox 4 I cannot install addons - help needed with new browser please

  • 1 reply
  • 8 have this problem
  • 52 views
  • Last reply by TonyE
  • Archived

ry1057@yahoo.com
ry1057@yahoo.com

Have tried to install add-ons, and whilst they appear to have installed nothing is added to the tools add-ons button.

Have tried to install add-ons, and whilst they appear to have installed nothing is added to the tools add-ons button.

All Replies (1)

TonyE
TonyE

This can be caused if one of the files that stores details of installed extensions is corrupt.

  1. Open your profile folder, for details of how to find it see https://support.mozilla.com/kb/Profiles
  2. Close Firefox
  3. Delete the following files if they exist, extensions.cache, extensions.rdf, extensions.ini and extensions.sqlite
  4. Re-start Firefox, it will then rebuild the list on installed extensions