资源必须列在web_accessible_resources清单键中，以便由扩展名外的页面加载

I have tried many ways( all documented procedures)to inject script into a specific page upon checking URL at onUpdated.addListener. Finally the below code with 'executescript' seems to work, but not perfectly. I could able to get alerts but can not able to find document elements of the page through getElementById/getElementsByName.I have tried many ways( all documented procedur