I recently came across this [[https://support.mozilla.org/en-US/questions/1276091|question]] when searching for a solution to unintentional detaching of tabs. The responses included mention of an addon as well as a new setting added in version 74 that sounded like the perfect solution for me by retaining the ability to detach a tab to a new window if explicitly requested via context menu. I configured allowTabDetach to "false" but today had a tab unintentionally move to a new window because I clicked on a tab too quickly while the mouse was in motion. I'm not sure if there was a regression in behavior for this setting or if perhaps it does not combine well with the Tree Style Tab extension.