This 100% -- the AI features already in Firefox, for the most part, rely on local models. (Right now there is translation and tab-grouping, IIRC.)
Local based AI features are great and I wish they were used more often, instead of just offloading everything to cloud services with questionable privacy.
Local models are nice for keeping the initial prompt and inference off someone else's machine, but there is still the question of what the AI feature will do with data produced.
I don't expect a business to make or maintain a suite of local model features in a browser free to download without monetizing the feature somehow. If said monetization strategy might mean selling my data or having the local model bring in ads, for example, the value of a local model goes down significantly IMO.
Which ones? Translation is local. Preview summarization is local. Image description generation is local. Tab grouping is local. Sidebar can also show a locally hosted page.
The last feature was the sidebar and Google lens integration. For the sidebar the "can" does the heavy lifting but you should also include that it's hidden and won't sync if you use a local page...
Local based AI features are great and I wish they were used more often, instead of just offloading everything to cloud services with questionable privacy.