Thanks but check out the other comments, or their subreddit, or any other HN FF thread. Many people have this problem.
Also i am a dev - i have tried all possible options to remedy this issue. I even wrote that i talked to FF devs directly. Wouldn't it be weird if i hadn't tried basic techniques?
It's like there is this weird tribal thing going on where there is this passive aggressive attitude towards the people having problems like "you guys must be idiots" even though there is dozens of comments with anecdata about no one using FF at their companies because of performance issues.
A lot of people have issues, some don't - doesn't make the ones that do have them complete imbeciles.