1 files changed, 24 insertions, 0 deletions
diff --git a/src/lib/TabCache.js b/src/lib/TabCache.js
new file mode 100644
index 0000000..16d6e1f
--- /dev/null
+++ b/src/lib/TabCache.js
@@ -0,0 +1,24 @@
+var TabCache = (() => {
+
+  let cache = new Map();
+
+  browser.tabs.onUpdated.addListener(tab => {
+    cache.set(tab.id, tab);
+  });
+
+  browser.tabs.onRemoved.addListener(tab => {
+    cache.delete(tab.id);
+  });
+  
+  (async () => {
+    for (let tab of await browser.tabs.query({})) {
+      cache.set(tab.id, tab);
+    }
+  })();
+
+  return {
+    get(tabId) {
+      return cache.get(tabId);
+    }
+  };
+})();