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You can use this either from the script's context menu or via bookmarklets.

MusicBrainz: Submit Edit (All Tabs)
javascript:(function(){ new BroadcastChannel('mb_edit_channel').postMessage('submit-edit'); })();

MagicISRC: Submit ISRCs (All Tabs)
javascript:(function(){ new BroadcastChannel('magicisrc_submit_channel').postMessage('submit-isrcs'); })();