User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.3pre) Gecko/20090818 Lightning/1.0pre Shredder/3.0b4pre I only get this issue with the LinuxToday RSS feed: http://feedproxy.google.com/linuxtoday/linux One of the links in the article are opened in Firefox and others in Thunderbird. Links from other rss feed articles and other links in this rss feed seem to always open in Firefox. Reproducible: Always Steps to Reproduce: 1. subscribe to LinuxToday RSS feed 2. download articles and choose one 3. click "Compete Story" below article text (link: http://go.internet.com/?id=474X1120&url=http%3A%2F%2Flinuxlock.blogspot.com%2F2009%2F08%2Flet-their-eyes-be-opened.html opens in Thunderbird ) 4. click "Home" link in menu to the left of article text (opens in Firefox ) Actual Results: Link opens in Thunderbird Expected Results: Link should open in Firefox This particular link has a different format to all other links in the article: http://go.internet.com/?id=474X1120&url=http%3A%2F%2Flinuxlock.blogspot.com%2F2009%2F08%2Flet-their-eyes-be-opened.html vs http://linuxtoday.com/infrastructure/2009081401035NWCY ( which opens in Firefox )

Do you have any extensions installed?

Yes Dan: British English Dic 1.19 CompactHeader 0.3.4 Lightning ( -current nightly ) Lightning nightly update Provider for Google calendar 0.6pre xSidebar 0.5 Thunderbrowse ( 3.2.6.3 ) is installed but disabled ( the problem occurred before I installed Thunderbrowse as well ) 1 theme: tb3 classic

What happens if you startup Thunderbird from the command-line using the -safe-mode switch? Does the bug still exist?

Hi Dan, same thing happens ...

Robby, does this happen if you create a new profile via profile manager? Use -P startup switch.

Aureliano can you test? Robby seems to be gone

Here seems that works fine relating to original post (Mozilla/5.0 (X11; Linux i686; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1) But both linux and windows show malformed page in TB (see attached screenshot) Windows release is Mozilla/5.0 (Windows NT 6.1; rv:11.0a1) Gecko/20111117 Thunderbird/11.0a1

This is due to the noscript tags - duping forward to bug 662907 as that has more info.