They could even be adventurous and offer multiple downloads with different extension bundles. These would be easy to implement; because extension bundling already exists as "collections"[1]. Something like:

- Standard Firefox with our officially recommended extension. (use for the front-page/default download)

- Minimal Firefox without any extensions or other optional features. ("Try this on older/slower computers")

- Developer Starter Kit with a selection of extensions related to web development.

- Social Media Special with more extensions like Pocket plus quality-of-life features for people that spend z lot of time on Facebook/etc.

Having a variety of options is important, because there isn't a universal spaghetti sauce[2].

[1] https://addons.mozilla.org/en-US/firefox/collections/

[2] https://www.ted.com/talks/malcolm_gladwell_on_spaghetti_sauc...