The back button will at times go back several pages or just one page. At one point it even went back one page but moved the URL back two pages.
Build was M10 source release. Compiled on glibc2.1.2 w/ gcc 2.95.2
On 1999111108 Linux, Redhat 6.0, I noticed that if you: start at mozilla.org. type in a new url, then click on a link. Stop it before the images completely load. Then hit back, it'll goto mozilla.org (skipping back 2 pages) while it should have gone to the second page.
I think the problem here is that pages are being added to the history when they're completely loaded. It should be happening when the browser first starts displaying something. Assigning to email@example.com, since I think it's probably a duplicate of an existing bug she owns. I think I filed a bug on something like this...
*** This bug has been marked as a duplicate of 13329 ***
[bugday] verified dupe. back button madness!