User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:2.0b5) Gecko/20100101 Firefox/4.0b5 Build Identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0b5) Gecko/20100101 Firefox/4.0b5 had firefox 4 beta4 (english, x86, winxp) running and just downloaded the unsigned win32 installer from ftp://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/4.0b5-candidates/build1/unsigned/win32/en-US/Firefox%20Setup%204.0%20Beta%205.exe right after the upgrade/installer completed, i tried to start the beta5. initially it presented me a little window in the middle of the screen where it was apparently checking some compatibility of plugins/addons or whatnot with displaying some progressbar. at the end of this compatibility checking window, a small popup appeared and i think the compat check window was already gone, and firefox complained about some part could not finish or so because of malfunctioning and something with secure channel. sorry i could remember the exact text, but i clicked to quickly ;(. after clicking the popup away, beta5 normally restored all my previously opened windows, tabs and panorama/tabcandy/tabgroups stuff and apparently works normally so i am filing this bug. although it seems that firefox process seemingly consumes 100% cpu core ever since i started it, and still hasnt calmed down, although its now already running quite a number of minutes, so maybe i need to file another bug or maybe its related, to the secure channel stuff as the original reason for this behaviour..... Reproducible: Always
This happened to me as well upgrading to beta 5 and again with my own build of b6pre.
I can also reproduce. Unrelated: note the build date of Fx4b5: 20100101. January 1st??