make it a toolbar button

background.js

@@ -1,41 +1,36 @@
-let currentTab;
 let currentOrigin;
+let supportedProtocols = ["https:", "http:"];
 
-/*
- * Switches currentTab to reflect the currently active tab
- * source: https://github.com/mdn/webextensions-examples/blob/91c8d7e7086fbc7bdb3032a217e63cc44a3b9320/bookmark-it/background.js
- */
-function updateActiveTab(tabs) {
-  let supportedProtocols = ["https:", "http:"];
-
-  function updateTab(tabs) {
-    if (tabs[0]) {
-      currentTab = tabs[0];
-      let urla = document.createElement('a');
-      urla.href = currentTab.url;
-      let newOrigin = urla.origin;
-      if (supportedProtocols.indexOf(urla.protocol) != -1 && currentOrigin != newOrigin) {
-        currentOrigin = newOrigin;
-        fetch(newOrigin + "/.env", {
+// based upon examples in https://github.com/mdn/webextensions-examples
+function updateActiveTab(tab, ocl) {
+  if (tab) {
+    let urla = document.createElement('a');
+    urla.href = tab.url;
+    let newOrigin = urla.origin;
+    if (supportedProtocols.indexOf(urla.protocol) != -1 /* && currentOrigin != newOrigin */) {
+      currentOrigin = newOrigin;
+      (async () => {
+        let resp = await fetch(newOrigin + "/.env", {
           "credentials": "omit",
           "redirect": "error",
           "referrerPolicy": "no-referrer"
-        })
-          .then(r => r.text())
-          .then(text => {
-            console.log(".env contains:\n" + text);
-            storage.local.set({ `${newOrigin}`: text });
-          });
-      }
+        });
+        if (resp.ok) {
+          let text = await resp.text();
+          console.log(".env contains:\n" + text);
+          let tmp = {};
+          tmp[newOrigin] = text;
+          browser.storage.local.set(tmp);
+        }
+      })();
     }
   }
-
-  let gettingActiveTab = browser.tabs.query({active: true, currentWindow: true});
-  gettingActiveTab.then(updateTab);
 }
 
 // listen to tab URL changes
-browser.tabs.onUpdated.addListener(updateActiveTab);
+//browser.tabs.onUpdated.addListener(updateActiveTab);
 
 // listen to tab switching
-browser.tabs.onActivated.addListener(updateActiveTab);
+//browser.tabs.onActivated.addListener(updateActiveTab);
+
+browser.browserAction.onClicked.addListener(updateActiveTab);

manifest.json

@@ -4,7 +4,8 @@
   "version": "0.1",
   "description": "fetches .env for every visited website and records successfully fetched ones",
   "permissions": [
-    "activeTab",
+    "storage",
+    "tabs",
     "*://*/*"
   ],
   "background": {