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There are other ways for webpages to get file uploads than this particular JS API. I upload files via firefox every single business day as part of my job.

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This JS feature doesn't upload the file to a server. This particular app says right there on the page that it does the magic in the browser.

You appear to be misunderstanding on how browsers handle file uploads. You cannot get the local file path for a file. There is no C:\ or /Volumes or whatever your OS uses. Browsers deliberately mask that from the upload.

You can 'upload' a file into a completely local web app just fine. The directory access is only necessary if you need the web app to be able to spontaneously write back to the original file on your machine, or if you want to read a whole directory tree, which might be slightly convenient for things like gerbers but can easily be dealt with in other ways (especially with gerbers, which you can distinguish by filename, something that the web browser does expose to javascript).

(and I do think it's kind of irritating that Mozilla is fighting against such useful features on somewhat patronising 'the users won't understand what permission they're granting' grounds)

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