We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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.

Avatar for Username

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

Natao arisiva ity resaka mitohy ity. Mametraha fanontaniana azafady raha mila fanampiana.

When I try to ad the following, this answer always comes up:oes not work. Same answer: Firefox could not install the file at https://addons.mozilla.org/en-US/firefox/downloads/latest/1865/addon-1865-latest.xpi?src=addondetail because: Unexpected install

  • 1 valiny
  • 0 manana an'ity olana ity
  • 11 views
  • Valiny farany nomen'i the-edmeister

AnonymousUser
AnonymousUser
more options

When I try to ad the following the answer is always:

Firefox could not install the file at

https://addons.mozilla.org/en-US/firefox/downloads/latest/1865/addon-1865-latest.xpi?src=addondetail

because: Unexpected installation error Review the Error Console log for more details. -203

This happened

Every time Firefox opened

When I try to ad the following the answer is always: Firefox could not install the file at https://addons.mozilla.org/en-US/firefox/downloads/latest/1865/addon-1865-latest.xpi?src=addondetail because: Unexpected installation error Review the Error Console log for more details. -203 == This happened == Every time Firefox opened

All Replies (1)

the-edmeister
the-edmeister
  • Moderator
more options

The answer is in the first thread you started - locking this as a duplicate. https://support.mozilla.com/en-US/forum/1/668996?