Is there any Chrome extension, by which I would be alerted by auto highlight when my keyword is found on a page?
I do not want to use crtl+f every time.
You could use a user script like the following:
This will highlight all elements (not just the matching text, as HTML doesn't work like that) that directly contain case-sensitive matches for the search string,
This solution uses the jQuery inclusion code from this Stack Overflow question. There might be problems with sites already including jQuery; you might be more successful with other solutions.