I tried the latest versions starting from 104 and I did not like them at all - the speed of opening pages dropped sharply, including the response to the dns request. Which is simply obvious if you run two versions 94 and 104 side by side. 94 works much faster, although, alas, some sites are already buggy in it. I'm really annoyed by the laziness of developers to support still fairly recent versions (for example, these same sites work fine on Chrome 83).
I also want to note that they removed the already deliberately unsupported option in the settings for prohibiting the creation of more than one process in memory.
The main thing that ruined FF (in addition to poor compatibility with sites compared to Chrome) is that starting from version 69 it is impossible to use the correct black and white font smoothing without damage to vision (when there are no shadows on the vertical and horizontal lines of the letter elements, i.e. the black- white anti-aliasing adopted earlier in W2K / XP) - which made fans sit to the last on FireFox. Now the only option that still saves your eyesight (and which is not in Chrome, where fonts are always blurry compared to the correct anti-aliasing in versions before 49, i.e. without using the buggy Direct Write mode in the engine) is to turn off anti-aliasing altogether. The fonts will of course be slightly clumsy, but very sharp, so much so that your eyesight will even improve immediately on your monitor and laptop (I guarantee you this). Of course, this does not apply to panels with high ppi from 250 and smartphones, where ppi is almost always above 300 now. the turbidity of the fonts there is already simply invisible.
By the way, we must also remember the mockery of Mozilla developers over FireFox users in version 68, etc. (where else fonts could be adjusted to properly anti-alias), they intentionally removed the position of the drop-down menu on the tab - open a new contribution (next to the current one). Such experiments are rapidly reducing the user population. Then it was returned, but there were a lot of people who wanted to use FireFox.
All the Mozilla team needs to start squashing chrome on PC/laptops (they don't have a chance on smartphones anymore) is to bring back normal black and white anti-aliasing without muddy fonts. Give the ability to explicitly disable the update, without annoying offers to update constantly and give more flexibility to customize the interface, and also increase the speed of the browser's response.
And more importantly, FireFox works worse with hardware decoding and playing videos on YouTube. Here it is programmatically, on old PCs and laptops it works better (which is surprising). But when decoding 4k video, the desire to use it on YouTube instantly disappears and you quickly switch to Chrome, where even older versions behave perfectly without loading the processor and video part with an increased load like FireFox.