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Firefox (linux) and Microsoft Web Apps - issues

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I'm having really odd behavior using Firefox (linux) with Microsoft 365 web apps (outlook, word, excel, etc). Its happening various distros too. Is there a known issue at this time with FF and 365 web apps?

   Excel - cell content deletion on moving through cells.
   Word - line content deletion on hitting carriage return.
   Mail/Cal - Webapp not displaying content on double clicking emails or calendar events.

Found a few sporadic similar reports from users on various forums, but no official note that it was a known bug. Assuming it isn't widespread - anyone here have any anecdotal reports of similar issues. Seems to only affect the linux distro versions of FF.

This renders the web app sites unusable with Firefox so I have had to use another browser for these apps. As these apps are ubiquitous with work and productivity, it's rendering Firefox as a second-choice browser unfortunately. No one really enjoys having to "pick the right browser" for work or play.

Is there any way to resolve these issues? Hoping someone has some insight.

I'm having really odd behavior using Firefox (linux) with Microsoft 365 web apps (outlook, word, excel, etc). Its happening various distros too. Is there a known issue at this time with FF and 365 web apps? Excel - cell content deletion on moving through cells. Word - line content deletion on hitting carriage return. Mail/Cal - Webapp not displaying content on double clicking emails or calendar events. Found a few sporadic similar reports from users on various forums, but no official note that it was a known bug. Assuming it isn't widespread - anyone here have any anecdotal reports of similar issues. Seems to only affect the linux distro versions of FF. This renders the web app sites unusable with Firefox so I have had to use another browser for these apps. As these apps are ubiquitous with work and productivity, it's rendering Firefox as a second-choice browser unfortunately. No one really enjoys having to "pick the right browser" for work or play. Is there any way to resolve these issues? Hoping someone has some insight.

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What OS? What Desktop? X11 or Wayland? Does it happen with Firefox in Troubleshoot Mode? Try downloading Firefox from Mozilla. Download, unzip, and run firefox-bin from the folder and see if you have the same issue. https://www.mozilla.org/en-US/firefox/all/#product-desktop-release

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OS: Fedora and Ubuntu Desktop: Gnome on X11 (both)

I've tried the direct downloads from Mozilla, plus the Snap (on Ubuntu) and the Flatpak (on Fedora).

This is across two different physical machines too.

The issue doesn't occur on chromium based browsers so my guess was maybe this is a somewhat intentional bug from our friends at Microsoft. It doesn't occur on Edge, Chrome, Brave or even Safari.

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If you could use screenrecorder or OBS and post a video on YouTube, that would be helpful. If it is a bug you can then create one. I don't have any issues with office besides copy and paste. Maybe try a live usb stick of another OS and Desktop (Gnome / KDE) ;-)) and see if you have the same issue. Use one of the many example files from Office so that we can try to replicate the issue. What graphics card and driver?