Improve Firefox compatibility

.gitignore

@@ -1,2 +1,4 @@
+.web-extension-id
+gog-affiliate-token-keeper.xpi
 gog-affiliate-token-keeper.crx
 gog-affiliate-token-keeper.pem

background.js

@@ -9,7 +9,7 @@ chrome.runtime.onMessage.addListener(
         if (request.message === 'set_gog_cookies') {
             COOKIES.forEach(function(name) {
                 let cookie = {
-                    url: 'https://*.gog.com',
+                    url: 'https://www.gog.com/',
                     name: name,
                     value: TOKEN,
                     domain: DOMAIN,

content.js

@@ -1 +1 @@
-chrome.runtime.sendMessage({"message": "set_gog_cookies"});
+chrome.runtime.sendMessage({message: 'set_gog_cookies'});