Ouch, good find. I had attempted to fix this kind of error by making the popup wider, but apparently that code is not working in some circumstances. I will investigate.
Hi Antonela -- I was able to reproduce this problem with the build you tested. It seems this behavior (cutting off long domains) was fixed in a later build. For example, I tried the latest nightly build:
and the doorhanger is wide enough to accommodate the onion address (see below). So what do you think? Should we leave this as is, or would it be better to wrap the long domain name to two lines anyway?
I discussed with Antonela, and we're going to leave this ticket open for now, and test the current behavior in the next alpha. Then we can consider wrapping the domain or other possible solutions.