How to configure firefox over command line on a linux machine

I use two Internet connections so i want to use bash scripts to automat开发者_开发问答e 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) firefox proxy settings via command line

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.