My chrome extension is not using content_scripts because I do not want to inject the code into every page. Instead, when the user clicks on the button a popup window opens and injects code into the page.
So, in the manifest.json there is a permissions block:
"permissions": [
"activeTab"
]
And in the popup.js there is this code:
chrome.windows.getCurrent( function(win) {
chrome.tabs.query({
'windowId': win.id,
'active': true
}, function(tabArray) {
// inject css & js only on initial click
chrome.tabs.executeScript( null, {
code : 'document.querySelector( "body" ).classList.contains( "_myExtension_code_injected" )'
}, function( result ) {
if ( result && !result[0] ) {
chrome.tabs.insertCSS( null, {
file: 'myExtension.css'
});
chrome.tabs.executeScript(null, {
file: 'myExtension.js'
}, function(){
chrome.tabs.executeScript(null, {
code: 'myExtension.init();'
});
});
}
});
});
});
The problem is some web sites open a popup window with additional information. And the URL of that popup page is "about:blank". If I try to initialize the extension, I see this message in the console:
Unchecked runtime.lastError while running tabs.executeScript: Cannot access contents of url "about:blank". Extension manifest must request permission to access this host.
I do not see a way to add a "about:blank" page to the permissions. And I really don't want to start using content_scripts just so I can set the match_about_blank setting.
I've tried adding "about:blank" and "about:* to the permission and all I get is an installation error.
There were warnings when trying to install this extension: Permission 'about:*' is unknown or URL pattern is malformed.
Is there a solution?
Update: Here is a gist with everything you'll need. A link to a jsbin demo included, but the problem isn't with that site specifically. The extension was originally tested on a yahoo mail pop-out window which you get by choosing to print an email.
