Earlier quoted context omitted.
My only problem with Pocket was that it was proprietary and it was integrated with Firefox. If it's released under and open source license, then I'll be glad to have it integrated. Pocket makes Mozilla competitive on mobile because Firefox's market share on mobile is very low.
"If it's released under and open source license, then I'll be glad to have it integrated." Not me. I don't want a bloated Firefox; even if the bloat is well intentioned and fully open sourced.
Firefox is open-source and (fairly) easy to build - if you really want the utmost control then I'd suggest this is the best way to do it. You can easily do a build that has no Pocket integration.
There's a cost to the level of configuration that I assume you're advocating here. Not saying we can't get better here, but there's definitely an impact on code complexity, QA test combinations, and stability.