I plan to build ESR final edtion after the ESR editon reached the maintenance period ( including firefox and thunderbird ).
Here is firefox 24.8.1 ESR_Final Edition link, thunderbid 24.8.1 ESR_Final Edition is being testing for stablity at present.
And except SCR and SmartRAM feature, firefox 24.8.1 ESR_Final Edition has added the feature:
Add Google GEO API Key ( You can test it from http://mozqa.com/data/firefox/geolocation/position.html and https://developers.google.com/maps/documentation/javascript/examples/map-geolocation, other custom build may lack this feature )
pcxFirefox 