In the past month or so I have been unable to upload files from my PC to any file hosting/sharing accounts: YouTube, Google Drive, Vimeo). Every attempt is either stuck at "Upload starting" forever (waited 24 hours), or part way through the upload will fail with no meaningful information. When I switch to Chrome it works every time as expected. Again, note that so far I have not had any ongoing issues with downloads. The occasional failure, but nothing noteworthy. I have tried removing Firefox from my machine, wiping all folders, caches, etc. reinstalling - nothing fixes this issue. It has continued over approximately three FF major updates. Please assist. Thanks.