I think any sensible adblocker to be already an absolutely vital part of any browser. I’ve also found the integrated pdf-viewer on Firefox to be a welcome addition, given how pdf-files mostly seem and feel like relatively simple web-pages (though pdfs can definitely be overcomplicated) to begin with. I’m thinking the recent Firefox VPN addition to be mostly bloat along with most of the current AI-features (maybe the translation-tooling being worthwhile as a core offering).