User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729) Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729) When changing zoom levels (use Ctrl++ and Ctrl+-) some horizontal and vertical lines disappear at different zoom levels. I have seen this on multiple websites, most frequently Wikipedia. Reproducible: Always Steps to Reproduce: 1. Open http://www.w3schools.com/tags/default.asp 2. Look at the table lines 3. Hit Ctrl+- or Ctrl++ 4. GOTO 2 Actual Results: Some horizontal and vertical lines disappear Expected Results: All lines should stay

I don't see this. ->Resolved Worksforme

Happens on a new installation of Firefox 3.5.2 on Windows XP sp2 as well.

I can confirm this: What I can see is that some lines appear to be thinner than others when zooming in or out. At some zoom levels, some lines disappear completely. Tested with latest trunk build: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.3a1pre) Gecko/20090906 Minefield/3.7a1pre (.NET CLR 3.5.30729)

Sorry, guys, this is a duplicate of bug 410959

Pascal at rockford dot com, By the way, if someone marks your bug as Resolved Worksforme, Probably leave it be, and if someone else can reproduce it they will reopen it.