“manifest_version”: 2 的時代, 有很多便利的地方, 但相對對隱私的保護較少，雖然宣告為 V2 但是還是會被限制。
content script to fetch content from any host without encountering the CORS problem in V2. However, things have changed in V3, and an error occurred when trying to fetch the API in the content script due to CORS restrictions.
解法1: Using the background script to fetch data
https://github.com/IOL0ol1/GetResponse
解法2:
https://javascript.plainenglish.io/fetch-data-in-chrome-extension-v3-2b73719ffc0e
