Messaging between background and content scripts

artem · 21.Январь.2019 14:55:41

There are 2 sendMessage functions in Chrome API.

chrome.runtime.sendMessage sends a message to all open extension pages (i.e. background, popup, etc.)
chrome.tabs.sendMessage sends a message to all content scripts from the extension in a given tab (possibly filtered by frame ID)

So, to send a message TO a content script, you need to use chrome.tabs . To send a message FROM a content script (or within the extension pages), you need to use chrome.runtime .

The event is chrome.runtime.onMessage in both cases.

See Messaging docs for more details.