Your cookie is never sent to our servers, not sure why you see the extension as a scam.
The source code for the extension can be seen here: https://github.com/Haydz6/Roblox-QoL

You can see what we save and store here: https://roqol.io/pages/privacy

The next update will include a way to access the extra outfits feature on phone

Edit: You can now use the avatar page on mobile

I made a fix for this a few weeks ago but I have been unsuccessful with the firefox reviewers. Chrome should work flawlessly though now

Edit: The fix was finally approved, it should no longer break randomly