URL: https://filesender.renater.fr/index.php?s=upload
Browser / Version: Firefox 72.0
Operating System: Mac OS X 10.15
Tested Another Browser: Yes Chrome
Problem type: Something else
Description: Site reports incorrent working with Firefox
Steps to Reproduce:
The website reporst a not-well-specified mulfunctioning of the service with Firefox and it encourages users to use "another browser". Why it mulfunctions and what they need from the Firefox API is not clear.
Screenshot
Browser Configuration
_From webcompat.com with 鉂わ笍_
Thank for the report @rubendibattista. Unfortunately, a special account is needed to be able to upload.

Taking in consideration the comment and screenshot, it seems Firefox is not supported.
Moving to Needsdiagnosis for further investigation.

@Renater is on github.
And the project is https://github.com/Renater/filesender which is a fork of
https://github.com/filesender/filesender/issues
@rubendibattista could you report the bug there and tell us the link after.
At least maybe they will have an explanation.
@karlcow Unfortunately the Github project does not support raising issues. I'll try to contact them.
Perhaps @monkeyiq could give some context for why this unsupported message is shown to Firefox users?
@miketaylr A quick grep of the main FileSender repo doesn't show this message. As an aside, I use Firefox most of the time during my testing and development here.
As most of my testing is with relatively small files there may be a problem I have not seen when using very large files and if there are browser specific issues in upload I would love to know more about them and remove the issue. The main FileSender project has an open issues page https://github.com/filesender/filesender/issues
Certainly raise an issue on the above link if a recent version of Firefox is crashing when uploading files of a given size. I mention the size part because I would love to be able to replicate such issues locally so I can try to work out a fix.
Meanwhile, I opened a ticket (I forgot to do that before). Let's see if we can have some hint... Maybe is specific to their fork.
Thanks for taking the time to look into it, @monkeyiq.
They just confirmed by email that the service has been updated this April, and now it's full compatible with Firefox. gg
This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue at https://webcompat.com/issues/new if you are experiencing a similar problem.
Most helpful comment
@miketaylr A quick grep of the main FileSender repo doesn't show this message. As an aside, I use Firefox most of the time during my testing and development here.
As most of my testing is with relatively small files there may be a problem I have not seen when using very large files and if there are browser specific issues in upload I would love to know more about them and remove the issue. The main FileSender project has an open issues page https://github.com/filesender/filesender/issues
Certainly raise an issue on the above link if a recent version of Firefox is crashing when uploading files of a given size. I mention the size part because I would love to be able to replicate such issues locally so I can try to work out a fix.