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

The application “Firefox” can’t be opened.

  • 1 reply
  • 1 has this problem
  • Last reply by jscher2000

more options

MAC OS 10.11.4

1) when i open firefox - I get this error message - The application “Firefox” can’t be opened.

2) when I try to start firefox in safe-mode same message as above

3) when I try to run /Applications/ -P The error message back /Applications/ Operation not permitted

4) When I trash can the firefox application and reinstall firefox - get the same error message as step 1

5) when I renamed Policies folder and then start firefox same error message as in item 1 above

6) when I trash can the firefox application with profile folder rename - and install firefox same as item 1

7) when I ran step 3 - the profile manger gui came up - then went away. when I ran step 3 again- I get the error in step 3

Please advise my options - I have bookmarks and security information I need to access - I made a copy of the Profiles folder before I started this process.

thanks, dan

All Replies (1)

more options

Hi Dan, as a Windows user, I am not aware of any secret Mac magic for this problem.

Assuming this began with Firefox 66, I wonder whether you might try installing Firefox 65.0.2 and see whether it can run. It may well want to update right away, but at least we can get a little bit of information this way.

This is the link for the U.S. English version. To choose a different language, please click the .. link (first on the list) and then you will find folders for all the supported locales.