1. Create a bookmark folder and put 3 bookmarks.
2. Open 2 tabs for google.com & gentoo.org
3. Click on "Open in Tabs" under the bookmark folder.
With Firefox 1.0.7
There'll be 5 tabs: 2 for google.com & gentoo.org and 3 for the bookmark folder.
With mozilla-firefox-bin 18.104.22.168
There'll be 3 tabs instead of 5: 2 for google.com & gentoo.org will be replaced by the first 2 bookmarked pages of the bookmark folder.
*** Bug 124027 has been marked as a duplicate of this bug. ***
Wrong product, read the description before filing a bug. This has zero in common with Gentoo Bugzilla!
Apparently not a Gentoo issue, report this upstream.