I'm quite baffled by this as i can't find how and why it's happening. For years i'm using Sublime Text to open ruby files and surely i have Xcode installed but except of command line tools i don't use Xcode as an IDE ever.

Just since today and no software update has been installed in this regard for weeks Xcode registers itself to open .rb files.

When i noticed i used Finder / Get Info and all the normal procedure to fix this. and this works but only for an hour or so.

Suddenly clicking a ruby file i notice how the file icon changes mid click from the dark grey with orange icon to the white page with red icon from Xcode.

Played this game 5 times today and even tried rebooting.

Is there a way to prevent this from happening?

Stop Xcode from Hijacking my File Associations

Sounded similar but only so far that for me this happens without any updates just after a short while multiple times a day.

  • By chance, do you use Firefox and uBlock Origin? Mar 23 '18 at 16:56
  • Yes using both, why?
    – neongrau
    Mar 24 '18 at 17:57

From the comments:

By chance, do you use Firefox and uBlock Origin?

Yes using both, why?

This is due to a mysterious bug in Firefox that is triggered by a recent update to uBlock Origin.

A fix has been applied to uBlock Origin to avoid the bug, however that patch has not made it to the latest release yet.

  • That's a really odd bug. Nice find! Confirmed your Bug on Bugzilla while i was at it.
    – neongrau
    Mar 24 '18 at 18:24

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