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Firefox can't copy from web forms
Firefox can't copy and paste from sites such as https://repl.it/languages/cpp http://cpp.sh/ while chrome can copy and paste just fine
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Many site issues can be caused by corrupt cookies or cache.
Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.
- How to clear the Firefox cache {web link}
If there is still a problem, Start Firefox in Safe Mode {web link}
by holding down the <Shift> (Mac=Options) key, and then starting Firefox.
A small dialog should appear. Click Start In Safe Mode (not Refresh).
Did this help?
While you are in safe mode;
Try disabling graphics hardware acceleration in Firefox. Since this feature was added to Firefox it has gradually improved but there are still a few glitches.
How to disable Hardware Acceleration {web link}
This page has a code column and an output column. Where you have problems copying from? Also, are you using a built-in method such as
- select with the mouse
- Ctrl+c or right-click > Copy
or are you using a different method?
Are Copy and Paste in the right-click context menu grayed (disabled) ?
The left panel of the two seems to be a special editor (.monaco-editor) that comes with its own context menu with Copy and others.
- dom.event.contextmenu.enabled = true
Copy in this special context menu only works if this pref is enabled.
- dom.event.clipboardevents.enabled = true
You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.