Firefox is garbage for editing Facebook posts and comments.
It's 2015 and we are up to what, version 845, because major versions only count and minors don't, like that makes a difference, and I can't write a post in a text editor and paste it into Facebook through Firefox. What gets pasted is not what I wrote and copied to the clipboard. I can't edit a comment or a post without it being garbled. Basic editing does not work in Firefox/Facebook. I don't know if this is Facebook crappy javascript or Firefox, but I do know that I can do what I set out to do on Chrome.
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Hi, mculver!
Although Facebook's Javascript is not the best thing of the world, I don't face this issue with my Firefox.
Could you check if your Firefox version is updated?
mculver,
Please try the Firefox Safe Mode to see if the problem goes away. Firefox SafeMode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes).
If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:
- Click the menu button
, click Help 
and select Restart with Add-ons Disabled.
If Firefox is not running, you can start Firefox in Safe Mode as follows:
- On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
- On Mac: Hold the option key while starting Firefox.
- On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
(you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
When the Firefox Safe Mode window appears, select "Start in Safe Mode".
If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, theme, or hardware acceleration. Please follow the steps in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.
To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.
When you figure out what's causing your issues, please let us know. It might help others with the same problem.