So there are a few distinct issues here: (1) bug 1847273 covers the fact that you don't get any more chances to launch Google Docs after you've tapped "Cancel" once. (i.e. that Firefox remembers that you don't want to open the app) (2) We need a new bug [will edit this comment and paste here] on the fact that docs.new gets stuck on a 302 redirect page if you arrive there by clicking the link from https://workspace.google.com/products/docs/ [Not sure if there are also other sub-issues to file or link this up to]
Bug 1984236 Comment 2 Edit History
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So there are a few distinct issues here: (1) bug 1847273 covers the fact that you don't get any more chances to launch Google Docs after you've tapped "Cancel" once. (i.e. that Firefox remembers that you don't want to open the app) (2) We might need a new bug [or maybe this is a version of bug 1980753] about the fact that docs.new gets stuck on a 302 redirect page if you arrive there by clicking the link from https://workspace.google.com/products/docs/ [Not sure if there are also other sub-issues to file or link this up to]