30 minutes per month for 3 posts. This leaves you 10 minutes each to write the content, create images and graphs for each post, adapt it for each platform and post it there.
That doesn't sound like 30 min work for me! I have no idea how this could be done in this timeframe.
This might be the fault of your ublock filters rather than Firefox. Do you have a cookie banner filter list? Some websites are blocking scrolling until you make a cookie decision. A short disable of ublock, rejecting the cookies should then work. The "downside" of a powerful ad blocker