https://developer.chrome.com/docs/extensions/reference/declarativeNetRequest/ https://developer.chrome.com/docs/extensions/reference/decla... Snippet from rule

https://developer.chrome.com/docs/extensions/reference/declarativeNetRequest/ https://developer.chrome.com/docs/extensions/reference/decla... Snippet from rules.json: { "id": 1, "priority": 1, "action": { "type": "block" }, "condition": {"urlFilter": "google.com", "resourceTypes": ["main_frame"] } }, { "id": 11, "priority": 1, "action": { "type": "modifyHeaders", "responseHeaders": [ { "header": "h1", "operation": "set", "value": "v4" }, { "header": "h2", "operation": "append", "value": "v5" }, { "header": "h3", "operation": "append", "value": "v6" } ] }, "condition": { "urlFilter": "headers.com/12345", "resourceTypes": ["main_frame"] } },