Server Spy See http headers returned by the server you're visiting. if you modify it by yourself, you need to zip it: zip -r /ramdisk/ServerSpy.zip * -x *.git* INSTALL bads.tm store https://extensions.bads.store Firefox mozilla webstore | GitHub Release Chrome https://chrome.google.com/webstore/detail/server-spy/mcgbfbichapcffmamnmgcobomdpgeagf why develop it firefox/chrome extension开发