How to inject CSS using content script file in Chrome extension?
I'm trying to inject my CSS from JavaScript which is injected as content script:
"content_scripts": [
{
"matches": ["http://www.google.com/*"],
"js": ["script.js"]
}
],
I found similar question about injecting CSS, but I encountered a problem while using code from accepted answer. Here's my script.js
contents:
var link = document.createElement("link");
link.href = chrome.extension.getURL("style.css");
link.type = "text/css";
link.rel = "stylesheet";
document.getElementsByTagName("head")[0].appendChild(link);
After I load some page this message appears in console:
Denying load of chrome-extension://phkgaaiaakklogbhkdnpjncedlbamani/fix.css. Resources must be listed in the web_accessible_resources manifest key in order to be loaded by pages outside the extension.
Is there any way to fix this? Or, maybe, some other way to inject a CSS from that JavaScript file?
Note: I can't include style sheet directly from manifest.
Solution 1:
You could add to the manifest's permissions field; See web_accessible_resources. So you would add this to the manifest:
, "web_accessible_resources": [
"fix.css"
]
See also "Programmatic injection". and insertCSS()
.
For most applications, forget all that createElement
code and just add the CSS file to the manifest:
"content_scripts": [
{
"matches": ["http://www.google.com/*"],
"css": ["fix.css"],
"js": ["script.js"]
}
],
although I understand that you don't want to do that in this exact instance.