Whenever I scroll through 'newest questions' some of the questions highlighted in blue, for example:
Why is this?
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Sign up to join this communityThat's how it shows up when you have a tag that you marked as one of your favorite tags. In your screenshot, that question has the tag that I see in your favorite tags list, on the right.
From the What do "favorite tags" and "ignored tags" do?:
Questions with these tags become highlighted on the front page.
Also, let me know you that it isn't because I haven't clicked that link in my browser.
mean?