I am using Firefox ESR on Linux. Does it make any sense to disable hardware acceleration for security reasons?

Whereas Firefox is open source, many hardware drivers, and most computer hardware are not. Enabling hardware acceleration in Firefox means using these non-open-source components, which could be a security risk. My impression is that bugs in drivers and hardware are able to cause far more damage than ones in userland software. Does this reasoning make sense?

Not sure if any of you have encountered the same resistance to using Signal. Some of my cousins refused to use Signal because they are already using "too many chat apps" (e.g. WhatsApp, Facebook Messenger, WeChat, Telegram, Line, Snapchat, etc.). To them, Signal will just be another chat app among their numerous other chat apps. I understand that jumping between so many messaging apps imposes some kind of cognitive and maintenance burden. What are some ways to convince such people to use Signal?