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This is a "boring" little problem that appears in Visual Studio Community 2015.
You can see the discussion in this Issue .
To solve the problem, just follow these steps:
"The point is that an adjustment is not being maintained. The solution is to manually change the configuration. Go to Tools->Options->Text Editors->HTML->Advanced and make sure that Identify Helpful Extensions is set to false. (Note , will be "false" if you have already discarded the yellow bar in the current session VS. in this case, only the action of showing the options dialog box and closing it with "OK" will be enough to persist the adjustment). "