As far as the "already running process", try the following in a command prompt:

su
<enter passord>
ps uxa

then check to see if you can find and confirm the web browser is listed in the column on the right. If it is then follow over toward the left and find the PID that the programming is running under and issue the following commands:

kill -9 <PID number>
exit
exit

Hope that helps.

When I die, I want to go peacefully in my sleep like my grandfather, not screaming and panicking like the passengers in his car.