I do use Firefox at work, because I can't really can't use my mac for most of the things I do. So usually when I start a new job at a new client one of the firts things I do is download Firefox or use my USB key to install the version I have on it. When 1.5 got released the first thing I did was to grab the official version (I had no time being at a new client to use RCs and report bugs against those). Installation worked very well and then I started using the beast. There is a nasty bug for corporate users in 1.5, the proxy authentification code is broken. Each time a element in a page needs to be fetch the authentification dialog pops up . This means I need to click ok in that dialog several times before the page loads. Tabs are unusable because of that dialog poping up. I filled bug 318253
I then started to use IE that was the machine. After a few weeks I was missing tabs so much that I neede firefox, and I switched back to 1.0.7, which is enough for my daily needs. The bug got a dup, but nothing much. I know those kinds of bugs are hard to debug because they might depend on the version and on the kind of proxy behind which I sit at work. I had time to killed and rememberde from the mozilla M days, thats some of the modules could log some informations to files. So I started googling with keyworks such as Necko, log , And finnaly I was up on Necko's project page where it took me some time to find the how to obtain logs from necko. I've created the log , changed the proxy name, and uploaded the logs in the bug. I hope this will help the developers fix this issue.