I'm in exactly the same position as the thread starter. except i am almost a total
working it out as i go along and i think I'm doing OK. i now hardly boot my windows partition except for if i want to use my web cam or if i want to play games.
i used one of the texts linked to above and found that for me it worked to add the line to the prefs.js file
user_pref("network.protocol-handler.app.http", "/usr/local/firefox/firefox");
where /usr/local/firefox is where i installed (copied the files to) fierfox then obviously the fierfox bit on the end is the script to launch fierfox.
here is my guide on what i done for a total noob. i hope it helps:
note: close thunderbird before you change the file as thunderbird will overwrite the changes on exit
you have to edit the prefs.js file, to get to this file just go to your home folder.
if you can see the .thunderbird folder doubleclick on it
--if you dont have hidden folders shown then type in ".thunderbird" at the end of the address line then press enter eg. "/home/USERNAME/.thunderbird"
you will then be able to navigate to the "default" (/home/USERNAME/.thunderbird/default)folder
from there find the .slt folder (i think the name before the .slt changes from person to person as mine is different to the one posted above) then in there open the "prefs.js" with your preferred text editor
Add the line to the bottom:
user_pref("network.protocol-handler.app.http", "/usr/local/firefox/firefox");
your installation folder for fierfox is probably differant from mine if ive put it in the wrong place let me know as I'm a noob.
this seemed to work for me. my installation opened up epiphany browser rather than konquerer :S. i hope this is of help. i still get the problem with it wanting me to create a new profile if i already have fierfox loaded (i just create one that is gone next time it asks me) hey this is a beta so there are bound to be a few rough edges but lets face it it walks all over M$ shit.
i hope this helps someone