User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0 Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0 See STR. Reproducible: Always Steps to Reproduce: 1. Go to http://www.google.com 2. Go to http://wiki.answers.com/Q/Is_nylon_a_insulator_or_a_conductor 3. View the Back history and/or press Back Actual Results: Two entries in the history on a clean profile. Four entries on my active profile (due to me being logged into some other sites?) - requiring four Back clicks to go back, of course. Expected Results: A single entry in the Back history. This is a regression: Firefox 3.6 does not exhibit this behaviour.

Regression Range : Works: Mozilla/5.0 (Windows; Windows NT 6.1; rv:2.0b3pre) Gecko/20100723 Minefield/4.0b3pre Fails: Mozilla/5.0 (Windows; Windows NT 6.1; rv:2.0b3pre) Gecko/20100724 Minefield/4.0b3pre Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=58101a16aff7&tochange=30239e4cebd8

Same behavior in GNU/Linux. WFM: Mozilla/5.0 (X11; Linux x86_64; rv:2.0b3pre) Gecko/20100723 Minefield/4.0b3pre 20100723030902 58101a16aff7 Reproduced: Mozilla/5.0 (X11; Linux x86_64; rv:2.0b3pre) Gecko/20100724 Minefield/4.0b3pre 20100724030705 30239e4cebd8 Thus, the Linux regression range is the same as in comment 1. Also reproduced in: Mozilla/5.0 (X11; Linux x86_64; rv:6.0a1) Gecko/20110414 Firefox/6.0a1 http://hg.mozilla.org/mozilla-central/rev/aa200a803e07

the only interesting bug there seems to be Bug 580819, cc-ing Blake

Just an observation, and probably irrelevant, but anyway... Using the Web Console in the latest nightly I get three entries like the one below: [14:52:01.497] An unbalanced tree was written using document.write() causing data from the network to be reparsed. For more information https://developer.mozilla.org/en/Optimizing_Your_Pages_for_Speculative_Parsing @ javascript:'<script>admeld_publisher%20%20=%2090;admeld_site%20=%20"wikianswersrow";admeld_size%20=%20"300x250";admeld_placement%20=%20"atf_wikianswers";</script><script%20src="http://js.admeld.com/meld120.js"%20target="_self"%20></script>':1

Bug 643452 has some similarities with the current one, but doesn't have the same regression window.

You actually want to be ccing smaug. ;)

dup of bug 646036? Though this is the better summary, 646036#c4 is about dataloss, due to overwriting the session history (if I understand bug 580819 correctly).

That's why I don't like jQuery very much.

This bug and bug 646036 seem to me fixed in the trunk. Maybe thanks to bug 646641 (or bug 673467 and bug 670318).

Confirmed; works in Nightly.