clean up misc deprecated function calls

Extensions/xkit_patches.js

@@ -21,10 +21,11 @@ XKit.extensions.xkit_patches = new Object({
 		if (XKit.browser().firefox === true && XKit.storage.get("xkit_patches", "w_edition_warned") !== "true") {
 			let version = XKit.tools.parse_version(XKit.version);
 			if (version.major === 7 && version.minor >= 8) {
-				fetch(browser.extension.getURL("manifest.json")) // eslint-disable-line no-undef
+				fetch(browser.runtime.getURL("manifest.json")) // eslint-disable-line no-undef
 					.then(response => response.json())
 					.then(responseData => {
-						if (responseData.applications.gecko.id === "@new-xkit-w") {
+						if (responseData.applications && responseData.applications.gecko.id === "@new-xkit-w" ||
+							responseData.browser_specific_settings && responseData.browser_specific_settings.gecko.id === "@new-xkit-w") {
 							XKit.window.show(
 								"W Edition warning",
 								"XKit Patches has determined that you are using <br><b>New XKit (W Edition)</b>, an unofficial upload of New XKit.<br><br>" +

bridge.js

@@ -51,7 +51,7 @@ function getBridgeError() { // eslint-disable-line no-redeclare
 
 function getVersion() {
 	var xhr = new XMLHttpRequest();
-	xhr.open('GET', browser.extension.getURL('manifest.json'), false);
+	xhr.open('GET', browser.runtime.getURL('manifest.json'), false);
 	xhr.send(null);
 	var manifest = JSON.parse(xhr.responseText);
 	return manifest.version;

manifest.json

@@ -33,7 +33,7 @@
   "permissions": ["storage", "unlimitedStorage", "*://*.tumblr.com/*", "https://new-xkit.github.io/XKit/*", "https://cloud.new-xkit.com/*" ],
   "version": "7.10.0",
   "web_accessible_resources": [ "*.js", "*.json", "*.css" ],
-  "applications": {
+  "browser_specific_settings": {
     "gecko": {
       "id": "@new-xkit",
       "strict_min_version": "115.0",