I want to install SaveFrom.net helper but when I go to the installation page https://addons.mozilla.org/de/firefox/addon/savefromnet-helper only the download of firefox is available and not of the addon. Firefox is already up to date and installed in the current version 75.0.
Do you have any anti-tracking measures or a user agent changer enabled?
Like for example AntiBrowserSpy from Abelssoft? https://support.mozilla.org/questions/1272239
https://support.mozilla.org/kb/how-reset-default-user-agent-firefox
Thank you for the hint!! Yes, I had AntiBrowserSpy installed.
It would never have occurred to me that the problem might be related to that. 
Thank you very much!!! Yes, I had AntiBrowserSpy installed.
The second link you posted helped me to resolve the problem. Thanks a lot!
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