"Half-baked" means Firefox adopts slogans like "protecting the open web" and it purports to represent the interests of web users, however its true goals are to generally to match Chrome feature-for-feature and preserve the status quo on the web which is that it provides an optimal medium for advertising. It gets over 90% of its financial support from Google, not web users.
From the comments some people's idea of a fully baked Firefox is a browser that generally works exactly like Chrome and Safari on the surface but is somehow better, e.g., because it does not overtly sell advertising services. An enormously complex program with a gazillion knobs and dials that no average web user would ever touch. Sending all search queries of these users to Google by default. Perfect.
Another idea of a fully-baked "Firefox" is one that has options to allow mere mortals to compile it from source on modest hardware in a reasonable amount of time. There could be multiple versions of Firefox, that could all be built from the same source tree, each a different compile time option, or a set of compile-time options. Some of these might exclude support for features that make the web optimal for advertising or commerce, i.e., essential features of Chrome or other "modern" web browsers. Scaled-down versions might be optimised for different experiences. Not all them driven by Javascript. For example, fast consumption of noncommercial content with minimal surveillance, and no advertising. Essentially "Reader Mode" as the default.
What is the point of having Firefox be open source if almost no one can download the source and start creating new and different web clients with it. Instead it is a project that only tries to keep pace with Chrome, getting larger and larger, more and more complex. It appears to have no other purpose. Tunnel vision. Follow the leader.
Make no mistake, I am not suggesting there should be no Firefox version that does almost everything that Chrome does, as there is now. Mozilla has supported use of the web for advertising and commerce. They have supported Yahoo, Inc. and Google, LLC. That's wonderful. Great job.
What I am suggesting is that Firefox should also have smaller, simpler versions that deliberately do not do all the things that Chrome does. Mozilla should also work to support noncommercial web use. Compile-time options to remove Javascript, telemetry and a host of other things some users may prefer to do without. Give people choice.