To improve security, the File System Access API's showOpenFilePicker and showSaveFilePicker will limit what characters are allowed in extensions for accepted file types.
Specifically only A-Z, a-z, 0-9, + and . will be allowed, extensions can't end in .local or .lnk, and can't be more than 16 characters long.
Pending (but since this addresses a security issue we would like to ship this without blocking on getting TAG review completed. We will try to address any feedback we would get later).
Gecko: No signal (https://github.com/mozilla/standards-positions/issues/154) This modifies the File System Access API, for which Firefox hasn't yet expressed an official position.
WebKit: Negative (https://lists.webkit.org/pipermail/webkit-dev/2020-August/031362.html)
Web developers: No signals
This is a mitigation for a potential security issue with the initially shipped feature.
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Make that LGTM2 since Alex had already sent an LGTM1.
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