I need to make Firefox automatically redirect me to mobile-friendly versions of some sites (e.g. BBC, Engadget) whenever I click a link to the desktop version. I have to do this to reduce my Internet bills when traveling overseas.
I tried changing the user agent string to that of the iPhone's, Nokia's Webkit, Opera Mobile, etc but found that some web sites don't automatically redirect me to their mobile sites.
What other options do I have?