Those browser.helpers.neverask should be set to 1, not mp3 lol. The values are Boolean there, 0 for false, 1 for true, empty if not defined.
So, the browser says "I should never ask about downloads?"
And @Scorpion Ghost says "audio/mpeg"
{
"manifest_version": 2,
"name": "mime-type-cancel",
"version": "1.0",
"permissions": [
"webRequest",
"webRequestBlocking",
"<all_urls>"
],
"background": {
"scripts": [
"main.js"
]
}
}'use strict';
const mimeTypeMatch = function (header) {
if (header.name === undefined) {
return false;
}
if (header.name.toLowerCase() != 'content-type') {
return false;
}
if (header.value.startsWith('image')) return false;
if (header.value.startsWith('text')) return false;
if (header.value.startsWith('font')) return false;
if (header.value.startsWith('application/json')) return false;
if (header.value.startsWith('application/javascript')) return false;
console.log('cancel content type');
console.log(header);
return true;
};
const headersReceived = function (request) {
return new Promise((resolve) => {
let filter = false;
request.responseHeaders.forEach(h => {
if (mimeTypeMatch(h)) {
filter = true;
return;
}
if (h.name.toLowerCase() === 'content-disposition') {
filter = true;
return;
}
});
if (filter) {
resolve({
cancel:true
});
return;
}
resolve();
});
};
browser.webRequest.onHeadersReceived.addListener(
headersReceived,
{
urls: ['<all_urls>']
},
[
'blocking',
'responseHeaders'
]
);
if ( (['facebook.com','google.com']).find( u => {
const uri = new URL(request.originUrl);
return u === uri.hostname;
}) ) {
resolve({});
return;
}cancel content type
<the blocked content type like application/json>
