Hi Saloni, and welcome to the forum! If you haven't done so already, I ask that you look over the Posting Guidelines.
As to your question, if you haven't got the vaguest idea as to how to start or approach a project like this, I would take it as a sign that you might be setting your sights too high. I don't know where your skill level lies, but it sounds like you should work with some more practical projects before moving on to something advanced like this.
Also, even though your intent may be good, this sort of tool could be construed as malicious. A tool that hooks into a user's browser can be user for all sorts of nefarious purposes. We tend to avoid helping with this sort of project.
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