Firefox 4 was functioning well until two days ago. Browser will not open to my home page and tool bars do not appear. Was able to find toolbar but "back" button does not work. What changed?

Firefox now opens to a blank page and the word Firefox appears in upper left hand corner in orange. It, apparently, contains a drop down menu. I can navigate from here but "back" button does not function in any website. How do I get it back to where it was previous to this change?

You can change this if you don't mind peeking under the covers into Firefox's about:config preferences editor.
(1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.
(2) In the filter box, type or paste newtab and pause while the list is filtered
(3) Double-click the browser.newtab.url preference and enter the desired value:
(i) Page thumbnails (default)
browser.newtab.url = about:newtab
(ii) Blank tab
browser.newtab.url = about:blank
(iii) Built-in Firefox home page
browser.newtab.url = about:home
(iv) Any other page
browser.newtab.url = full URL to the page
Press Ctrl+t to open a new tab and verify that it worked. Fixed?

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