I have just found the new 2nd profile app and it sounds great. I downloaded it to try as I use FF in 3 locations which need 3 different proxy settings and I thought this might be a nice quick way of starting up FF already set up for the location without having to edit the proxy each time.
What I found, thought, was that everything in the 2nd profile was "reset", i.e. no addons, bookmarks etc. Is there a way that I can easily get them synchronised so that I only need to change the proxy setting?
Yes, and it's quite easy.
You just have to copy the profile folder from one to the other. Then you will have two identical profiles. Then just change the proxy settings in one. Rinse & repeat.
If you just need to have different proxy configurations depending on your location, there is an easier way to proceed. There is no need to duplicate your profile. You just have to use an automatic proxy configuration file.
Hereby you will find a sample file:
Put that file "proxy.pac" in folder "%USB_DRIVE_LETTER%:/PortableApps/CommonFiles" and set the following url in Firefox settings (Advanced -> Network -> Settings -> Automatic proxy configuration URL) : "file:///%USB_DRIVE_LETTER%:/PortableApps/CommonFiles/proxy.pac"
This tip can also be used with Thunderbird and any other Mozilla applications