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This isn't true. If you had the pref set to the default value before, it should change to the new default value when you upgrade.

[Note: I am a Firefox developer.]

Maybe I should file a bug report then?

[Note: I literally just downloaded it, upgraded, and had this experience.]

Yes, that would be great!

Worked perfectly fine for me.

Ctrl + F displays number of instances found in a page in Chrome but not in Firefox. Can you please fix it.

The bug is 8 years old and nobody seems to be working on it. I wouldn't hold my breath that it will be fixed soon.

This is the classic example of FOSS apathy towards users.