I have tried to reproduce the issue on Windows 10 and Ubuntu 20, on Firefox Nightly 94.0a1 (2021-09-28)(64-bit) and Release 92.0.1 (64-bit) versions, but I was unable to reproduce it. Tabs behavior is correct when dragging.
Could you answer the following questions in order to further investigate this issue?
- Does this issue happen with a new profile? Here is a link on how to create a new profile: https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles
Does this issue occur in the latest nightly version of firefox? Here is a link from where you can download it: https://www.mozilla.org/en-US/firefox/channel/desktop/
Are you using any addons? If so, please list them. Please, can you go to Help -> More Troubleshooting Information and copy at least the "Add-ons" information into an attachment here?
If you are still able to reproduce it, please, share further information with us, like screenshots, screen recording, or more specific steps.
I've assigned a component in order to get the dev team involved.
'Core - Widget GTK ' team: if the component is not relevant please change it to a more appropriate one.