I'm assuming by 'direct link' you mean a link that might be in an email or a that a user types directly into their browser.

The first question you have to ask is:  How would Google know about your direct link?  The assumption with a direct link is that the user didn't use Google for a search.  

It's possible that Google would know because you have installed Google Analytics.  Google has apparently said that that won't use the data from GA to influence rankings.  However, this is a matter of debate:  https://webmasters.stackexchange.com/questions/129807/malicious-bot-mulitple-cities-and-browsers and https://www.seoblog.com/analytics-affect-rankings-seo/


As to what browsers the user is using, it's probably irrelevant as that wouldn't change the money that Google makes for displaying advertising, which is why they're really in business.

My own personal experience is that direct visits/links may inform Google of content that Google has not indexed yet, and therefore their algorithm may put a priority on indexing the page with a direct link.