[Help Wanted] Firefox: CTRL/CMD + U to upload a file does not work

[jasonblais]

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Difficulty: Intermediate

Details: Jira ticket

Repro:

1. Sign into Mattermost on a Firefox browser
2. Set focus to a message box
3. Hit CTRL/CMD + U

Observed: No action taken

Expected: A dialog opens, letting you upload files.

[Rudloff]

I can't quite reproduce on Firefox 52.0a2 (on Linux). I get a warning about a popup window for some reason but if I allow popups it then works correctly.

[jasonblais]

@Rudloff I tried on Windows 10, Firefox and it seems to reproduce

I didn't get any warnings about a popup window so I'm not sure if that's why.

[tejasbubane]

I was not able to reproduce this on Firefox 65.0.1 (64-bit) on MacOS Mojave 10.14.3. Pressing Cmd-U opened a file upload box. Is this OS specific?

[DHaussermann]

I tested this on 2 different Windows 10 machines and can't repo an issue.

On FireFox 54 - I was prompted by the pop-up blocker and had to allow the pop-up (or trust the site) to get the file window open.

On FireFox 65 - The file window opened without issue.

It may be that some users are not seeing the prompt to allow the pop-up if the browser is configured to hide it.

[jasonblais]

Thanks @DHaussermann for verifying! Given it doesn't reproduce on Mac/Linux (from above testing, thanks all!), and we don't support Firefox 54, I'll close this issue.