they've definitely improved it. I used to type "gad" and this thread would NEVER come up. On Firefox its worked flawlessly. But this change is very recent. I had a conversation with a Mashable editor via Google+ a while ago and I ran through test after test and we both concluded that Chrome just sucked. This was only mid 2012. But I've been using Chrome since 2009 or so and it's been bad since. So the improvements must've come, but it's pretty recent. As I pointed out, back in the day you'd get search options for like half of the things you type in in the URL bar. Now it seems the search results are minimal.
Considering this kinda stuff takes so many years to fix makes me pretty disappointed in Chrome. I do admit Chrome is faster than FF in page loading on desktop, but as long as you have a decently fast computer (not my work computer), then it's less of an issue. That's why I have no qualms using FF at home. Plus, the adblock on Chrome doesn't really block ads or does it? Last I read it just "hides them."
Depends who you ask and where the data comes from. Other stats have Chrome passing Firefox well over a year ago.
Also, the desktop share is going to become less relevant over time. It doesn't matter of Mozilla had 90% of the desktop share if in in 10 years mobile usage will completely dwarf it.
I think it does matter. As long as desktop share is still a relevant chunk of browser use, it affects what people think. If Mozilla has a 90% share on desktop, then as people move to mobile, the first thing they think of is "Oh I need to download Firefox." Kinda like why there's such a demand for Office viewers on mobile, and there's so much talk of Microsoft actually launching Office on iOS/Android. Now if mobile usage completely dwarfs desktop usage, then you're right desktop share means nothing. But while we're in that transition phase, your perceptions on desktop make a big deal. Just like Gmail had a huge dominance and people used desktop to view it. As a result, Gmail support is demanded on iOS and Windows Mobile.