User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:103.0) Gecko/20100101 Firefox/103.0

Steps to reproduce:

Very frequently, Firefox will hang temporarily (10 -30 seconds) while copying text form input fields. It does not respond to any input. I cannot switch tabs. The cursor does not change. After 10 - 30 seconds, Firefox begins to work normally.

Actual results:

Freezes when highlighting text and copying.

Expected results:

No freezing.

The Bugbug bot thinks this bug should belong to the 'Core::Layout: Form Controls' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Can you attach a profile when this happens using https://profiler.firefox.com? That would allow us to diagnose the problem. Just installing the profiler and hitting record, then reproducing the issue should be enough, but let me know if you hit any issues.

Thanks!

Thanks! Shareable URL for that profile: https://share.firefox.dev/3PBGln9

It seems it's spending all that time in external code (uiautomationcore.dll). There seems to be some accessibility stuff going on.

Jamie: Do you know what uiautomationcore.dll is / what can be done about this?

User: Can you attach your about:support information? Does going to about:config and changing accessibility.force_disabled to 1 fix this for you?