When using Chrome Dev Tools, I can block a request, and when I open or close Dev Tools, the request is still in the "Network request blocking" tab. It means it keeps a history of networks which I blocked.

With Firefox, as soon as I close my Dev Tools, my blocked requests are gone. Every time I open my Dev Tools in Firefox, I need to search through my notes to remember which requests I need to block, instead of being able to simply select a request from a list of previously blocked requests like in Chrome.