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

Add-on cannot be installed

  • 5 replies
  • 0 have this problem
  • 21 views
  • Paskiausią atsakymą parašė MarionFirefox

more options

After a new installation of Firefox I tried to install Add-On. For all Add-Ons I tried it fails with the message as in the picture attached. When I install it on other computer where I also have Firefox no problem occurs. The picture shows the AdBlocker add-on, which is widely used and to my opinion cannot be corrupted. The error-message is in Dutch and my English translation would be: "Installation is cancelled because the Add-On seems to be corrupted".

Do have a solution/explanation?

After a new installation of Firefox I tried to install Add-On. For all Add-Ons I tried it fails with the message as in the picture attached. When I install it on other computer where I also have Firefox no problem occurs. The picture shows the AdBlocker add-on, which is widely used and to my opinion cannot be corrupted. The error-message is in Dutch and my English translation would be: "Installation is cancelled because the Add-On seems to be corrupted". Do have a solution/explanation?
Pridėtos ekrano nuotraukos

All Replies (5)

more options

Thanks for your replay so fast... I had a Firefox installation that was in English suddenly, could not install the Dutch language. So I uninstalled the Firefox using Windows-Settings-Apps->Remove (the Firefox installation was 2GB what was strange as the new install is only 200 MB). When removed I did a new install from the Microsoft Store for Firefox.

PS. The old installation did have e.g. the AdBlocker Add-On .

more options

Dropa said

You should only install FireFox from Mozilla not from Microsoft store. That isn't the supported version if you are looking for help with.

Mozilla would not put their Mozilla Firefox on the Microsoft Store if it was not going to be a supported version.

https://blog.mozilla.org/en/products/firefox/firefox-the-first-major-browser-to-be-available-in-the-windows-store/ https://support.mozilla.org/en-US/kb/download-firefox-windows-microsoft-store

Note if were to follow Dropa's suggestion of using Firefox setup from mozilla.org

from the above sumo article.
Warning: Running Firefox installed from Mozilla and running Firefox installed from the Microsoft Store will create two separate Firefox profiles.
more options

Are you using ESET security software ?

more options

If you are using ESET, you need to disable it or add mozilla. org to its trusted sites. Updating it may also fix the issue.

more options

Thanks for your suggestions. I thought there was no problem on the other laptop when I would install an add-on. But now there is the same problem too. We indeed use ESET, I disabled ESET (For internet security and Computer security) but the problem that an add-on could not be installed remained. Meanwhile I have chosen to continue with Chrome as there the add-on I prefer can be installed. I do appreciate your help. And by the way my husband still uses Firefox so hopefully there it will be solved in time.