I understand maybe wanting "total control" over your own devices, but to just completely reject security warnings seems like a net negative overall.
"It would be too slow (and privacy-invasive) to contact a trusted server every time the browser wants to establish a connection with a web server. Instead, Firefox downloads a list of bad URLs every 30 minutes from the server (browser.safebrowsing.provider.google.updateURL) and does a lookup against its local database before displaying a page to the user."
It has some utility, and some costs: traffic noise, some privacy leak, system complexity, centralization.
On balance it's not for me so I disabled it.