How to configure firefox over command line on a linux machine

Question

I use two Internet connections so i want to use bash scripts to automate the task of switching between the two.. the problem is i cant able to configure firefox proxy settings via scripts, so is there a way to do that... does any configuration file exists for firefox so that i can modify over command line..

I have read this entry but this dint helped me much.. (its on windows) http://stackoverflow.com/questions/843340/firefox-proxy-settings-via-command-line

Answer 1

you can use the "automatic proxy configuration" for this. this field takes a "pac" file which in fact is just a javascript function named FindProxyForURL that can use things like dnsResolve or isInNet to determine wether a proxy is needed or not. there is a wikipedia article which describes the files in detail and i have written a blog post a while a go that gives an example function.