Steps to reproduce:
?"Expected results:
There are no layout issues.
Actual results:
There is a small format issue.
Notes/Issues:
Verified on AMO-stage FF53(Win 7). Issue is reproducing on all AMO servers.
Screenshot:

This is only because the space before the colon in our french translation is not a non-breaking-space, I'll try to fix that via Pontoon and see where how it goes.
submitted a suggestion to the french translation, let's see if that get's accepted.
This popup will go away in #6028
This was fixed by removing the popup in #6028 .
Marking verified fixed.
Postfix screenshot:

Most helpful comment
submitted a suggestion to the french translation, let's see if that get's accepted.