I have Ubuntu 8.04.1, kernel 2.6.24-19-generic (Hardy Heron) and am in the USA. I have installed the 386 version instead of the AMD64 version (my laptop is an AMD64 laptop). When I use Firefox that comes with Ubuntu, the spell checker works inconsistently. On contractions (won't, doesn't, etc.) it's reporting these as misspelled most of the time. On other misspelled words it is not catching these, but only sometimes. When I rightclick in the textarea and uncheck "Check Spelling", then turn it back on again, it properly checks the spelling. This used to not occur for me in my last Ubuntu that I used, which was Ubuntu 7.04 with Firefox 2.
I'd love to see some movement on this bug. I'm sure that if it worked okay in FF2, that it's probably just a simple fix for FF3?