How can I add adsense to my chrome extension?
Have you read the program policies:Ads in Chrome Apps and Extensionshttps://developers.google.com/chrome/web-store/program_policies
Currently, AdSense may not be used to serve ads in Chrome extensions or packaged apps, per AdSense policies.
AdSense in packaged apps is being worked on. See the discussion here: https://groups.google.com/a/chromium.org/forum/?hl=en&fromgroups#!topic/chromium-apps/_47r_YKRdjA
In the meantime, star this issue: https://code.google.com/p/chromium/issues/detail?id=132602