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When I click a Gdrive item in firefox it always opens in the current tab.
This is really frustrating if I'm working in a folder that is many levels deep and I open a document I have to open Gdrive again in another tab and navigate all the way back to the folder I was in to get to another document.
In chrome when I click on a google drive item (such as a Gdoc or gsheet) it will open in a new tab by default.
It appears this was once an option google docs, but it has now been removed...