I have problems with different new AddOns. When I like to install them it says on the respective AddOn page “only in Firefox-Download Firefox” now.
What can I do about it, I have, of course, the actual Firefox installed?
Do you use anything that changes your user agent or “anonymizes” you?
Not that I know. As an example I have the problems with downloading AdBlock Plus which worked before (the problems with the certificates I think in version 66.0.4
I just noticed that I have the problem with any AddOn or Theme.
If you don’t have an extension installed that would override the user agent, please check that you have the default user agent: https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox
Hi BoBo, the following test page will show you the user agent your Firefox sent it in red text:
https://www.jeffersonscher.com/res/jstest.php
Example: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0
Some users have had security/privacy software that adds text to the end of the user agent string, which breaks the Add-ons site’s ability to determine that you are running Firefox.
Thanks to everybody, the user agent was not correct. After a reset everything is working now