Can the missing extensions still be located in the addon manager? To check this, please type about:addons in your Firefox address bar and select Extensions from the sidebar.

Please ensure that your desired addons are enabled and up-to-date. To update your addons, please click the gear and select Check for updates from the drop-down menu.

Note: You may need to restart Firefox for the addons to finish updating.

G'day Wesley Tried updates all up to date even did a Refresh, Unfortunately still got the problem.

Any help would be appreciated.

Regards

Phil

If you go back into the addon manager, are the addons disabled or have they completely vanished from the list?

Some antivirus programs will try to remove addons that you install on Firefox. Please ensure that none of your security or maintenance programs are doing this.

G'day Wesley

Ya I delete the file extensions.json via open help menu then click on Troubleshooting information the i click on show folder thats were i delete it.

Then i close Firefox and all my extensions are returned, after a while i go back to them and they have have they completely vanished from the list?

I use Kaspersky which as give me no problems in the past so dont know whats going on other than a update from Firefox

All help appreciated

Regards

Phil

It sounds like something is causing your Firefox profile to become damaged. This could mean that another file in your Firefox profile is corrupt and is causing the extensions.json file to not function properly. Can you please try creating a second Firefox profile using the Profile Manager?

Doing this will give you a new clean profile while still preserving your old profile. You can then test the profile by adding your extensions and seeing if they will disappear. This will help to determine whether the issue is isolated to only the old profile or whether a third party program is causing the damage.

Please refer to these Mozilla support articles for information about creating a Firefox profile and backing up information:

• Profile Manager - Create, remove or switch Firefox profiles
• Profiles - Where Firefox stores your bookmarks, passwords and other user data
• Back up and restore information in Firefox profiles

Just to confirm, are all of your extensions disappearing or are specific ones disappearing?

Please also take note of the new add on signing. If the version of the addon/extension does not have a signed version, it may not appear in about:addons