fix: use host as domain instead of finding tld for firefox

[DP19]

fixes: #68

[srlehn]

I probably put the host trimming there. I think I remember that Firefox had too much on the cookie host compared to chrome, but can't be certain anymore, too long ago and I missed saving files for later...

@zellyn can we remove the trimming?

[srlehn]

Introduction of the bug was via my PR #15.

Thanks a lot for the fix!