I need assistance with a basic browser extension that involves injecting CSS:
{
"manifest_version": 2,
"name": "User Style Sheet Workaround",
"version": "1",
"content_scripts": [
{
"matches": ["<all_urls>"],
"css": ["default.css"]
}
]
}
My goal is to have default.css injected as user origin instead of author origin. Any suggestions on how to achieve this?
To inject CSS into a webpage, utilize chrome.tabs.insertCSS with the option cssOrigin: 'user' within the background script's URL change event.
For instance, you can use chrome.webNavigation.onCommitted (which requires the webNavigation permission) or chrome.tabs.onUpdated (which does not require any special permissions).
Make sure to include the target sites where CSS injection is allowed in the permissions section.
Example manifest.json:
{
"manifest_version": 2,
"name": "User Style Sheet Workaround",
"version": "1",
"background": {
"scripts": ["bg.js"]
},
"permissions": ["<all_urls>"]
}
bg.js:
chrome.tabs.onUpdated.addListener((tabId, info) => {
if (info.status === 'loading') {
chrome.tabs.insertCSS(tabId, {
file: 'style.css',
cssOrigin: 'user',
runAt: 'document_start',
// allFrames: true,
// matchAboutBlank: true,
}, () => chrome.runtime.lastError); // ignoring errors
}
});
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