diff --git a/core/corehttp/commands.go b/core/corehttp/commands.go
index c5443f6eb3f3..4381288efd21 100644
--- a/core/corehttp/commands.go
+++ b/core/corehttp/commands.go
@@ -44,6 +44,8 @@ var defaultLocalhostOrigins = []string{
 	"https://[::1]:<port>",
 	"http://localhost:<port>",
 	"https://localhost:<port>",
+	"chrome-extension://nibjojkomfdiaoajekhjakgkdhaomnch", // ipfs-companion
+	"chrome-extension://hjoieblefckbooibpepigmacodalfndh" // ipfs-companion-beta
 }
 
 func addCORSFromEnv(c *cmdsHttp.ServerConfig) {
diff --git a/test/sharness/t0401-api-browser-security.sh b/test/sharness/t0401-api-browser-security.sh
index 1e36bcead325..d7bd3a67d3fb 100755
--- a/test/sharness/t0401-api-browser-security.sh
+++ b/test/sharness/t0401-api-browser-security.sh
@@ -39,6 +39,21 @@ test_expect_success "browser is able to access API if Origin is the API port on
   grep "HTTP/1.1 200 OK" curl_output && grep "$PEERID" curl_output
 '
 
+test_expect_success "Companion extension is unable to access API with invalid Origin" '
+  curl -sD - -X POST -A "Mozilla" -H "Origin: chrome-extension://invalidextensionid" "http://127.0.0.1:$API_PORT/api/v0/id" >curl_output &&
+  grep "HTTP/1.1 403 Forbidden" curl_output
+'
+
+test_expect_success "Companion extension is able to access API if Origin is the API port on localhost (ipv4)" '
+  curl -sD - -X POST -A "Mozilla" -H "Origin: chrome-extension://nibjojkomfdiaoajekhjakgkdhaomnch" "http://127.0.0.1:$API_PORT/api/v0/id" >curl_output &&
+  grep "HTTP/1.1 200 OK" curl_output && grep "$PEERID" curl_output
+'
+
+test_expect_success "Companion beta extension is able to access API if Origin is the API port on localhost (ipv4)" '
+  curl -sD - -X POST -A "Mozilla" -H "Origin: chrome-extension://hjoieblefckbooibpepigmacodalfndh" "http://127.0.0.1:$API_PORT/api/v0/id" >curl_output &&
+  grep "HTTP/1.1 200 OK" curl_output && grep "$PEERID" curl_output
+'
+
 test_kill_ipfs_daemon
 
 test_expect_success "setting CORS in API.HTTPHeaders works via CLI" "