Ways for Firefox to fight DRM: don't implement DRM.
Doing this has put Firefox in a really awful strategic position for fighting DRM on the Web in future. Once large swathes of content starts being DRMed - which is only feasible if all major web browsers support it - Mozilla will not be in a position to fight future encroachment, such as demands from their DRM provider for access outside the sandbox to verify the decrypted data isn't being siphoned off. They won't be able to do anything to stop being pictures being DRMed either, should their DRM provider decide to support it. It's not clear they'd even be able to fight DRM on entire HTML pages since doing so may risk losing video DRM support and access to vast swathes of the Web.
To be honest, Apple are more likely to pose an obstacle to web DRM than Mozilla at this point. While they plan to support EME too I suspect their financial terms for using it may well go beyond what content providers are willing to pay.
Doing this has put Firefox in a really awful strategic position for fighting DRM on the Web in future. Once large swathes of content starts being DRMed - which is only feasible if all major web browsers support it - Mozilla will not be in a position to fight future encroachment, such as demands from their DRM provider for access outside the sandbox to verify the decrypted data isn't being siphoned off. They won't be able to do anything to stop being pictures being DRMed either, should their DRM provider decide to support it. It's not clear they'd even be able to fight DRM on entire HTML pages since doing so may risk losing video DRM support and access to vast swathes of the Web.
To be honest, Apple are more likely to pose an obstacle to web DRM than Mozilla at this point. While they plan to support EME too I suspect their financial terms for using it may well go beyond what content providers are willing to pay.