I want to take the source code of each Web page as input and address on it, how can I do this?

I'll develop an add-on for mozilla firefox, but for this I need the source code for each page. This is necessary to find the tag button inside the source code, to search for the tag href in the source code, etc... So please help me for this.

The forum of the add-on is here:
https://forums.addons.Mozilla.org/

Tags: Firefox

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