I think that one of many causes of dropping of Firefox from the leader position were difficulties with its deployment and management on business environments. Changes are coming – part one – installation.
step.1. download the msi package from Firefox and prepare with orca and put it on fileshare eg:
\\krai.local\NETLOGON\firefox\firefox.msi
step.2. create the standard software installation GPO and link it to Computers OU
Computer Configuration > Policies > Software Settings > Software installation > New > Package