Gmail caches all external urls. That makes it impossible to read the most recent data of the dynamic images (i.e. votes and other server generated images).
How the extension works:
1. The extension works in background mode and it's logic is executed only if the opened tab URL is https://mail.google.com/*
2. In the extension's Option page - you can list all domain names, those you want to enable dynamic images (stop caching).
谷歌浏览器、其他Chromium内核的浏览器
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