Firefox 4.01 various problems - Any Ideas please?

Question

OK so I have had Firefox 4.01 Installed for several days now and it is certainly far from the best browser I have used is a fair statement I think. I have tried 4.0 and that lasted less than 5 minutes! 4.01 is here and I am SO trying to get it to work and am failing fast. But still here and trying to find ways to get around the many problems. But I STILL fail to see why the Lads and Lasses at Mozilla see the need to change the tables and bring out a totally unstable browser which simply is not up to the usual standards that all (well OK nearly all apart from a few notable exceptions?) the rest of Fire fox version have been.
My problems range from:
On Opening a New version of the FF browser I get at least 9 different browsers open, NOT 8 or !) but always 9?
I also get a copy of a Poker Site opening it's doors and inviting me in to play? I think this is a popular one as It opens at several sites when browsing ordinarily.
On being asked if I would like to save a particular password a pop up appears for the site. Now nothing untoward in this ? Except that it ONLY opens for certain sites. No rhyme or reason why it does it simply does, I can do what the heck I like though as it doe's NOT disappear when I chose my option be it yes or no or maybe. It does not close and as it is over the options tab for Firefox the only way to be rid is to actually close Firefox from the red cross and open it again, I then get the 9 lots of browsers open as well.
On closing Firefox it also opens as a Fire Fox page, no home page (Google Menu page for Google .co.uk) as it is set. Just a blank Fire Fox page.
And instead of opening at all the pages I had open as before it opens as I say the 9 different browser pages and none of them are even home pages.
I open another page in another window, I get the open window but nothing will open i it at all. Not the page I want to and none of the pages I bookmarked no ages at all just an open page.
Bookmarks, while we are on the subject, Bookmarks do not open as you would expect them to, hard to explain this one, bu Bookmarks do not open as you expect them to. I simply cannot explain how they open as I simply cannot remember as my memory is so bad. But suffice to say something is wrong with them also.
Add Ons, like the spelling/Dictionary British one. It has ALWAYS closed when it wants to. I check words and get say out of 100 words 10 are misspelled. I go to correct them and after I have corrected the first word it closes down? I.E. it stops highlighting words. I take out the checkmark for Spelling and then open it and check it again and then it seems to work OK checking all misspelled words OK. But it also misses some words too? Like it may see the word so and it spelled sol and it checks it and you can correct it. BUT it may see the misspelled word of spl (Sol)and that is certainly NOT a word! BUT it may not at first check it as a misspelled word? OK this time it has and may be next time I see a misspelled word I can point it out? But it ode also go wrong. And this is again something i am NOT familiar with as my memory is so bad I sometime forget how to spell words! But I do know as soon as I see them they ARE misspelled!
See my problem is I send them to Mozilla or whomever it is as a feedback report and It seems NOTHING is done!!! Now what gets me is IF the basic programme works 99% WHY is the new one so bad?? Where only 80% of it works as it is supposed to?? It is not good for the people who plan it out and is certainly not good for us who use it!! I am so far SO dis-enamoured with Fire Fox I am SERIOUSLY thinking of going to another Browser! And it is about as far as it can get before I do!! So PLEASE someone can they at least TRY and reply to this message and tell me some one is doing something....well not just me but ALL users of Fire Fox and MOZILLA products as there is going to be a mass exodus of users away from all this stands for and has stood for for years now! We are NOT imbeciles and please do not treat us as such! You MAY be very clever and are able to pu something like this together BUT you ARE human beans as well and never lose sight of that!
Give us something to look forward to!
Yours Aye
Chris Goddard

Answer 1

I checked the crash reports but could not establish the cause of the crashes. The number of tabs open is unlikely to have an impact upon this.
One of the associated bug reports indicates that it may be related to extensions. Try the procedure in the following link to start Firefox in safe mode and see if it still crashes. If it does not crash in safe mode it indicates that an extension may be causing this.
https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes