Now you've forced me to make at at least two more decisions: to open up addons.mozilla to find a cookie-management extension, and to open up addons.mozilla to find a javascript-permissions-management extension.
At each of these interactions, I would be confronted with the worst possible next-actionable-step: a large, seemingly unbounded number of options. Picking any of them then requires an additional interaction to confirm, possibly whilst (realistically speaking) disregarding scary-looking security warnings about what the extension will be able to do with my first-born child.
Of course, IRL, users respond as you'd expect when given such immediate negative feedback. They will make it through at most one forced-decision interaction. By the time they hit #2, the user's goal will become "install Chrome", not "figure out which extension to install next".
It's really important to recognize here that the extension search/installation/configuration user flow is more-or-less indistinguishable from actively punishing the user for using firefox. Oh, so you want to use firefox, and actually do something? Kindly direct this barrage of STOP NO DONT feedback to your decision-making apparatus until it comes around to it's senses and installs something, anything else.