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added missing ) - since I've bumped the question anyway, I might as well do other corrections
Martin Sleziak
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The questions which are in different color are those ones, which have one of your favorite tags.

From What do “favorite tags” and “ignored tags” do?:

  • Questions with these tags become highlighted on the front page.
  • Questions with new activity are shown on stackexchange.com/filters.
  • In the review queues, questions from these tags are shown to you before other questions.

The actual color is different for various sites - it depends on the design and color scheme of the actual site. (For example, they are highlighted with different color on Mathematics than on MathOverflow.)

Martin Sleziak
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