fix extraction of images to not get true as altags or empty src images

extension/background.js

@@ -472,10 +472,18 @@ function contentDispatch(funcName, args) {
     }));
   }
   function extractImages() {
-    return Array.from(document.querySelectorAll("img")).map(img => ({
-      alt: img.alt,
-      src: img.src,
-    }));
+    return Array.from(document.querySelectorAll("img")).map(img => {
+      const src =
+        img.src ||
+        img.getAttribute("data-src") ||
+        img.getAttribute("data-lazy-src") ||
+        img.getAttribute("data-original") ||
+        (img.srcset ? img.srcset.split(",")[0].trim().split(" ")[0] : "") ||
+        "";
+      const FAKE_ALT = new Set(["true", "false", "null", "undefined", "image", "img"]);
+      const alt = img.alt && !FAKE_ALT.has(img.alt.trim().toLowerCase()) ? img.alt.trim() : "";
+      return { alt, src };
+    }).filter(img => img.src !== "");
   }
   function extractText() {
     return document.body.innerText;