For those who have issues with constant login screen. All you have to do is:

1. go to Settings -> Privacy and Security
2. scroll to Cookies and Site Data
3. click Manage Exceptions
4. in field Address of website enter https://tagpacker.com
5. click button Allow
6. click button Save Changes

I guess Tagpacker should put this guide in plugin description.

This add-on does unfortunately not work with another add-on. I have to disable "Privacy Possum" on every page which I want to add a bookmark.

If I don't deactivate it, while adding a Tagpacker, the add-on window starts reloading infinitely. And on the "Privacy Possum" add-on window you can see how the numbers for "cookie" & "referer" sky rocketing within seconds.

Every Site except for the Tagpacker Homepage does not work with this add-on if you wanna keep Privacy Possum.

Screenshots:
https://droppy.lixl.nl/$/oLrev
https://droppy.lixl.nl/$/vMEET

Don't feels I logged in. So don't working the extension