Per-Site Proxy Switcher от mikecoding

Per-Site Proxy Switcher lets you route traffic through a proxy per site or domain. Import rule sources, auto-update rules, enable global or per-domain proxy, get smart prompts on failed/slow loads, and test or debug your proxy setup directly from Firefox.
根据域名决定tab是否使用代理，支持自定义规则源、自动更新、全局代理与按域名代理，网页加载失败/过慢时自动提示是否走代理。