User Agent: Mozilla/5.0 (X11; Linux i686; rv:13.0a1) Gecko/20120201 Firefox/13.0a1 Build ID: 20120201031146 Steps to reproduce: 1) Opened the URL http://en.wikipedia.org/wiki/Latin-derived_alphabet 2) opened the web console (ctrl-shift-k) 3) entered document.body.innerHTML. (note the dot at the end) Actual results: browser hung indefinitely dont know if this hapens for other sites .. Expected results: browser should have continued working ..

I can reproduce on other page such as https://developer.mozilla.org/En/Code_snippets . This happens since Firefox7. And I got Unresponsive script dialog as follow A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete. Script: resource:///modules/AutocompletePopup.jsm:198 A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete. Script: resource:///modules/AutocompletePopup.jsm:300 Regression window: Cannot reproduce: http://hg.mozilla.org/mozilla-central/rev/0577771f2065 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0a1) Gecko/20110624 Firefox/7.0a1 ID:20110624082701 Can reproduce: http://hg.mozilla.org/mozilla-central/rev/0421a3198a3c Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0a1) Gecko/20110624 Firefox/7.0a1 ID:20110624115816 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=0577771f2065&tochange=0421a3198a3c Suspected: Bug 651501

I experienced the same issue with "document.body.outerHTML.".

I tried both: document.body.outerHTML. and document.body.innerHTML. on https://developer.mozilla.org/En/Code_snippets with Nightly 17.0a1 (2012-08-01) & Windows XP mode and couldn't reproduce. Then tried both on the same website, however this time on FF v14.0.1, Windows 7 Ultimate, and was able to reproduce both times. The first time I terminated FF soon after. On the second time I got the unresponsive script warning, with error message: "A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete. Script: resource:///modules/AutocompletePopup.jsm:198"

Thanks for testing. This is fixed by bug 775812.