Should be built right into the core of Firefox.

Ironically web extensions are more secure, better for the user -- yet here we are, more news of Spyware add-ons finally getting blacklisted after hundreds of thousands of downloads.

The damage was already done. Since we have to do our own vetting process, we need the tools. We have a source viewer. Now we need a diff viewer to checks updates and an add-on firewall to manage the connections.