Any idea why scribblings appear in Firefox?

Applications
1

Seems to only happen while using Firefox on Linux distros.

Must refresh page in order to remove be able to do anything (like copy) with the text.

Have basically same extensions on Vivaldi too and it doesn’t do it there.

2

Maybe accidentally pressing a hotkey combination enables that feature?

3

Maybe, but none that i am aware of.

Plus, even if right-click makes the line disappear, must still refresh if i want to copy some text.

4

Have you got any helpful grandchildren😉

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