Working nice. I’d like a setting for a white color icon though, black theme, I can’t see it ^^

Works exactly as expected! Unlike other window merge plugins, Merge All Windows only merges into the window you activate the plugin in.

Does what it says! Open source! Keyboard shortcuts! What more can you ask for?

The only Merge Windows extension that actually merges windows to the one you have selected instead of all tabs disappearing into a minimized window somewhere.