Does Ctrl+V work to paste ?

Any relevant-looking messages in the Web Console ?

• https://firefox-source-docs.mozilla.org/devtools-user/web_console/

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

• switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Thanks for your reply. It was helpful but unfortunately not conclusive. Firstly Cntrl+V does work. It's just the right button click that does not. In Troubleshoot mode and normal restart I can paste with a right click once only. Thereafter the dialog box changes and just shows the emoji option.

MODERATOR NOTE:

Recommendations to flip dom.events.testing.asyncClipboard to true are a fundamentally bad idea. This pref was meant for automated testing, and bypasses all security/permission checks on clipboard access.

If you toggle this pref, any site has full access to your clipboard all the time without asking you or you even noticing so we suggest that you do not touch that pref.

Had the same problem with firefox and outlook web.

My solution was:

   open "about:config" in firefox (type it in the webadress line and hit enter)

   accept the risk in the pop up

   type "clipboard" in the search line

   change the following settings (as shown in the image attachment) from false to true (klick on false)

   restart firefox (close it & open it again)

Thanks for your reply. Unfortunately the changes mad no difference. Best C