Why can't I install AdBlock Plus? I keep getting the message that the signing cannot be verified, but I'm getting the download from the Mozilla site.
I have tried to install AdBlock Plus from the list of Add-ons on Mozilla, but I keep getting a message that the installation was not allowed because signing could not be verified.
All Replies (2)
If its asking about the author verification then you can simply allow and install.
If you have a program called "TDC Digital Signatur" installed on your computer, it may interfere with critical parts of Firefox, including add-on compatibility check, add-on update and Firefox update.
You can try installing it from AdblockPlus website: http://adblockplus.org/en/
This support link might help as well: https://support.mozilla.com/en-US/kb/Unable%20to%20install%20add-ons
Good luck.
Thanks. For some reason, I'm doing all these steps and it's still not working. But I appreciate your suggestions.