Sidecar files don't work at Danbooru website. Mass uploader opened in new tab = fail

[ProximaNova]

Using Firefox for all of the following

As of this revision: https://github.com/Seedmanc/Booru-mass-uploader/pull/30#issuecomment-565768249 plus line 372 to line 445 changes AND at least one older revision: . Sidecar files don't work at a Danbooru website, see: .. https://github.com/Seedmanc/Booru-mass-uploader/issues/29 .. https://github.com/Seedmanc/Booru-mass-uploader/pull/30

As of this revision: https://github.com/Seedmanc/Booru-mass-uploader/pull/30#issuecomment-565768249 plus line 372 to line 445 changes: . If you are using a Danbooru website and click the mass upload link so that it opens in a new tab, one of two things will happen: .. The page will only say "not found" .. The mass uploader page will load but when you try to upload anything you will get this--"Couldn't upload examplefilename.jpeg: error, access denied. Try logging in. Stopped."--the only way to get it working again is open the websites homepage in a new tab then click mass upload so it opens in the tab you are on.