After my recent posts on Dancing Pigs and Almost Chrome I've pretty much switched completely to Chrome. Today was the final nail in the coffin. Mozilla announced the End of Life for Firefox v3.
As far as I've seen nothing has been resolved with the tab width issue. Chrome still has the Gmail formatting issue but I've mitigated it somewhat by turning off the Default Text Styling Lab. The resulting e-mails are not as pretty but they've all had consistent formatting.
Firefox 10, 11, 12, or whatever it is today still suffers with the extensions version problem. The Internet Storm Center has a good diary on this issue.
Time to move on.