Whenever I highlight text with left-click on FIrefox AND Chromium (!) I get a small annoying dialog window "Share Selection" asking me to share it on Facebook, GMail or Twitter. How can I disable this?? Te source of this might possibly come from an add-on, so I've listed them here. I've disabled all of the "suggestions" in Settings, but doesn't help.

Because it happens on both browsers, even if I disable extensions, it may be some sort of HTML on the visited pages, but it seems to be ubiquitous occurring across websites.

I'm lost!

Add-ons / Extensions:

Bitwarden Cookie-Autodelete DuckDuckGO Privacy Essentials Facebook Container Firefox Multi-Account Containers LastPass Privacy Badger Privacy Possum HTTPS Everywhere Tranquility Reader uBlock Origin Windscribe