Transform into a web extension

manifest.json

@@ -8,8 +8,9 @@
 	},
 	"permissions": [
 		"tabs",
-		"activeTab",
-		"webRequest"
+		"webRequest",
+		"webNavigation",
+		"*://*/*"
 	],
 	"browser_action": {
 		"default_icon": "icons/browser_action_disabled.png",

src/background/main.js

 var NO_DATA = {
 	badge: "",
-	syntax: "",
-	fetch: function () {
-		return new Promise(function (resolve, reject) {
-			reject("No data!");
-		});
-	}
+	syntax: null,
+	target: null
 };
 
 var allTabs = {};
 
+var MIME = {
+	"text/n3": "N3",
+	"application/n-triples": "N3",
+	"application/n-quads": "N4",
+	"text/turtle": "TTL",
+	"application/rdf+xml": "RDF",
+	"application/ld+json": "JSON",
+	"application/trig": "TRIG"
+}
+
+
 function getTabData(id) {
 	if (!allTabs.hasOwnProperty(id)) {
 		allTabs[id] = {
@@ -113,13 +120,11 @@ function detectDataOnLinks(headers) {
 		return NO_DATA;
 	var links = parseLinks(linksContent);
 	for (var j = 0; j != links.length; j++) {
-		if (links[j].rel == "alternate" && links[j].type == "text/n3") {
+		if (links[j].rel == "alternate" && MIME.hasOwnProperty(links[j].type)) {
 			return {
-				badge: "N3",
+				badge: MIME[links[j].type],
 				syntax: links[j].type,
-				fetch: function (url = links[j].url) {
-					return fetchAt(url);
-				}
+				target: links[j]
 			};
 		}
 	}
@@ -131,30 +136,34 @@ function detectDataOnContent(tabId, headers) {
 	if (contentType == null)
 		return NO_DATA;
 	contentType = contentType.split(";")[0];
-	if (contentType == "text/n3") {
+	if (MIME.hasOwnProperty(contentType)) {
 		return {
-			badge: "N3",
-			syntax: "text/n3",
-			fetch: function (tabId = tabId) {
-				return fetchContent(tabId);
-			}
+			badge: MIME[contentType],
+			syntax: contentType,
+			target: "content"
 		};
 	}
 	return NO_DATA;
 }
 
-function detectData(tabId, headers) {
-	var linkedData = detectDataOnContent(tabId, headers);
-	if (linkedData == NO_DATA)
-		linkedData = detectDataOnLinks(headers);
-	data = getTabData(tabId);
-	data.linkedData = linkedData;
-	updateIcon(tabId);
+function onHeadersReceived(details) {
+	data = getTabData(details.tabId);
+	if (data.linkedData != NO_DATA)
+		// already detected something
+		return;
+	data.linkedData = detectDataOnContent(details.tabId, details.responseHeaders);
+	if (data.linkedData == NO_DATA)
+		data.linkedData = detectDataOnLinks(details.responseHeaders);
+	updateIcon(details.tabId);
 }
 
-function onHeaders(details) {
-	detectData(details.tabId, details.responseHeaders);
+function onBeforeNavigate(details) {
+	data = getTabData(details.tabId);
+	data.linkedData = NO_DATA;
+	updateIcon(details.tabId);
 }
 
 // listen to received headers
-chrome.webRequest.onHeadersReceived.addListener(onHeaders, { urls: ["<all_urls>"] }, ["responseHeaders"]);
+chrome.webRequest.onHeadersReceived.addListener(onHeadersReceived, { urls: ["<all_urls>"] }, ["responseHeaders"]);
+// listen to received headers
+chrome.webNavigation.onBeforeNavigate.addListener(onBeforeNavigate, { urls: ["<all_urls>"] });
\ No newline at end of file

src/content/main.js

+chrome.runtime.onMessage.addListener(
+	function (request, sender, sendResponse) {
+		
+	});
\ No newline at end of file