Created attachment 576909 [details]
Build identifier: Mozilla/5.0 (Windows NT 5.1; rv:10.0a2) Gecko/20111123 Firefox/10.0a2
Please increase the left-margin because text is drawn right next to the vertical line. It would offer better readability.
Padding was added in bug 700770. This was landed on aurora today and should reach the update channel tomorrow.
Thanks for the report!
Created attachment 578545 [details]
Verified fixed on Mozilla/5.0 (Windows NT 5.1; rv:10.0a2) Gecko/20111201 Firefox/10.0a2