Chrome Extension Manifest 'Matches'
You need to surround the value of the content_scripts field in square brackets:
"content_scripts": [ { "matches": ["http://*"], "js": ["scripts.js"]} ](see the Chrome Docs for more info)
Incidentally, using http://*/* would be a better match for all urls (see the docs), adding https://*/* if you also need to match those as well.
Edit:
Following your edit, the error you are getting is because of the match pattern being incorrect.
If you want to match every URL, then Google has a special pattern just for this purpose: <all_urls>
Sample usage:
"matches": ["<all_urls>"],See this page for more info:https://developer.chrome.com/extensions/match_patterns
Any match pattern should be of the following structure [scheme]://[host][path]
- scheme is '*' | 'http' | 'https' | 'file' | 'ftp'
- host is '' | '.' (any char except '/' and '*')+
- path is '/' (any chars)
For matching any HTTP/S and FILE URL use:
"matches": [ "*://*/*", "file://*/*" ],Ref: https://developer.chrome.com/apps/match_patterns
By the way, in order to allow access to local files - add the permission:
"permissions": [ "file://*/*"]Or approve file access on the extension settings page.