What is the error message or specific issue you are having with updating Firefox? Try updating again. There's a new Firefox 67.0.4 that has just been released. If the internal updater doesn't work, try the full download. See Update Firefox to the latest release for more information.

I see that you are running the new macOS 10.15 Catalina Preview release, which is a "Beta" release. There is a forum at https://forums.developer.apple.com/community/beta/macos-1015-beta where this was just posted: https://forums.developer.apple.com/thread/118529 Firefox Software Update can't be opened (quote)

banjoeyes Jun 21, 2019 12:44 PM (in response to acelab)

I had the same issue until yesterday. Firefox came out with a new update version 67.0.4 which now opens for me. I had to Trash Firefox from the Applications Folder then download and install the new version 67.0.4 from Mozilla.You will have to select the "Open Anyway" button in the Security & Privacy/ General pane of System Preferences.

Does that help?

Solution: (from Apple Developer website as linked above)

- Open Terminal - copy and paste the following line: sudo spctl --master-disable

-hit enter - Enter your password - Hit enter

Then Open FIREFOX from the Applications folder in Finder

To reinstate GateKeeper (the thing that was blocking it from opening) Close terminal and reopen Terminal from fresh

enter: sudo spctl --master-enable Enter password

Firefox will still open in future

See https://www.mozilla.org/en-US/firefox/68.0.1/releasenotes/ macOS releases are now signed by the Apple notary service, allowing Firefox to properly run on macOS 10.15 Beta releases

You can download the full installer, if needed, here: https://www.mozilla.org/en-US/firefox/all/

AliceWyman said

What is the error message or specific issue you are having with updating Firefox? Try updating again. There's a new Firefox 67.0.4 that has just been released. If the internal updater doesn't work, try the full download. See Update Firefox to the latest release for more information. I see that you are running the new macOS 10.15 Catalina Preview release, which is a "Beta" release. There is a forum at https://forums.developer.apple.com/community/beta/macos-1015-beta where this was just posted: https://forums.developer.apple.com/thread/118529 Firefox Software Update can't be opened (quote)

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banjoeyes Jun 21, 2019 12:44 PM (in response to acelab)

I had the same issue until yesterday. Firefox came out with a new update version 67.0.4 which now opens for me. I had to Trash Firefox from the Applications Folder then download and install the new version 67.0.4 from Mozilla.You will have to select the "Open Anyway" button in the Security & Privacy/ General pane of System Preferences.

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Does that help?

For the record, a new Catalina bug was recently posted: Bug 1570451 [10.15] Firefox and Thunderbird crashes on start in MacOS 10.15 (Catalina) dev beta 5 19A526h Haik Aftandilian [:haik] Comment 37 • 2019-08-06 05:18 EDT (quote) We've confirmed with Apple that the fix for this problem is going to be in macOS Catalina Beta 6.