Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Mozilla Support में खोजें

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

tried installing ublock, oldest version, got an error message: could not install the file at https://addons.cdn.mozilla.net/user-media/addons/576580/block-0.

  • 5 प्रत्युत्तर
  • 4
  • 3 views
  • के द्वारा अंतिम प्रतियुतर James

more options

All attempts to install any add-ons from the Mozilla add-on page resulted in the same message: Firefox could not install the file at

https://addons.mozilla.org/firefox/downloads/file/400263/foxyproxy_standard-4.5.6-fx+sm+tb.xpi?src=api

because: Signing could not be verified. -260 What's this signing thing and why can't I download any add-ons???

All attempts to install any add-ons from the Mozilla add-on page resulted in the same message: Firefox could not install the file at https://addons.mozilla.org/firefox/downloads/file/400263/foxyproxy_standard-4.5.6-fx+sm+tb.xpi?src=api because: Signing could not be verified. -260 What's this signing thing and why can't I download any add-ons???

All Replies (5)

more options

You've got (out-of-the-Ark) Fx 3.6.28; I've got Firefox 44.0.2. I think this will explain nearly all of your problems. Someone else will give you the best advice on how to start again with Firefox for your Mac.

more options

Hello hattiejean, alan_r

alan_r said

You've got (out-of-the-Ark) Fx 3.6.28; I've got Firefox 44.0.2. I think this will explain nearly all of your problems. Someone else will give you the best advice on how to start again with Firefox for your Mac.

Confirm, alan_r is correct, the problem is definitely the 3.6.28 firefox, but hattiejean you can't install latest firefox, the one you use is the latest for your 10.4 Mac.

thank you

more options

You can use the third-party TenFourFox to be much more up to date and secure. http://www.floodgap.com/software/tenfourfox/

It is based on the Firefox 38.6.1 ESR release.

more options

The OP has an Intel Mac according to the user agent, so using TenFourFox isn't possible.

  • Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9.2.28) Gecko/20120306 Firefox/3.6.28

I don't know if you can update your Mac to OS X 10.6 to be able to install the current release.

cor-el द्वारा सम्पादित

more options

Doh could have sworn it was PPC.