If you can’t copy and paste properly on Facebook without the comment or message becoming jumbled up, you may have to allow a certain Firefox setting in the about:config that allows clipboard events to function properly on Linux distros.
Open a new tab and type:
Double click on this entry to set it to true and copying and pasting correctly from the clipboard should function as expected now.
This fixed the issue for me when I could not copy and paste on Facebook messenger or comments on Firefox.
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