If Firefox understood your context, which is even more important on portable computers such as laptops and especially smartphones, there are so many things Firefox could do to improve your experience. And potentially even more interesting is if that type of information could be used on web sites in a privacy protected manner.

Joe gets home from work around 5:15pm every day. After arriving he usually checks a particular news site and web comic.
Maybe he checks the news site frequently so it already has a high frecency rating, but the humor site is a once a day web comic so it doesn’t have as high a rating. But we can easily determine that on weekdays, during the 5 o’clock hour Joe is very likely to visit that comic. So when he opens a new tab it is suggested at the top of the list.

Joe spends a good chunk of time on work related sites, but after work they’re the last things he wants to think about, so their lack of visits after 5 actually downgrade their suggestion priority during that time period.
He also checks the weather before going to bed (around 10:30) and a sports website on Saturday mornings.

These are all patterns we should be able to analyze & anticipate. And just like with the location bar, patterns are updated as new ones arrive (e.g. students during the school year vs the summer).

Actually, now that I think about it, this behavior may also be applicable in the location bar too.

This was building off an idea from the previous post:
https://blog.mozilla.org/labs/2012/10/improving-firefox-with-locally-analyzed-data/

Where if users were to carry around their profile in Firefox, a site might not even need the user to log in (using cookies) to do personalization. Every time the user visits the site, it can automatically customize to the user’s newest interests.

i understand that this is a Labs project, and this is all experimental and opt-in at the moment, but i don’t like the standard you are setting with this move. if something like this ever comes to Firefox proper, and by default Firefox starts blocking some tracking and advertising dollars, how is this better than Microsoft turning DNT: 1 by default for IE users?

how do you know it’s in the user’s interest _not_ to be tracked? has anyone, ever, anywhere, shown some _actual_ harm to any one user from ad tracking?

what if users like more targeted instead of random ads for things they are not interested in? what if users actually _like_ for (free) websites they are visiting to earn a living, even if it’s through targeted ads (a pretty plausible assumption in my book, as they have already chosen to visit the website).

(and not to mention giving users a false sense of security, when the more insidious, invisible and undetectable tracking through browser fingerprinting can’t even be stopped, not using this, nor any other measure)

again, i understand you are not doing that right now, but it looks like that’s the direction you are heading in, and i don’t think it’s good for the health of the free and open internet..