# HG changeset patch
# User Rob Krum <biggestsonicfan@gmail.com>
# Date 1695432215 25200
#      Fri Sep 22 18:23:35 2023 -0700
# Node ID e6a8a9f0956d124e8de34eb4bcf09d8e17077d9d
# Parent  5dbbabbfaca21d2c5994f95ed095313284611c44
Bug 1822730 - Add basic blob protocol handling for blob URIs that contain parsable http/s protocols

diff --git a/toolkit/mozapps/downloads/DownloadLastDir.sys.mjs b/toolkit/mozapps/downloads/DownloadLastDir.sys.mjs
--- a/toolkit/mozapps/downloads/DownloadLastDir.sys.mjs
+++ b/toolkit/mozapps/downloads/DownloadLastDir.sys.mjs
@@ -216,38 +216,49 @@ export class DownloadLastDir {
       Services.prefs.setComplexValue(LAST_DIR_PREF, nsIFile, aFile);
     } else if (Services.prefs.prefHasUserValue(LAST_DIR_PREF)) {
       Services.prefs.clearUserPref(LAST_DIR_PREF);
     }
   }
 
   /**
    * Pre-processor to extract a domain name to be used with the content-prefs
-   * service. This specially handles data and file URIs so that the download
-   * dirs are recalled in a more consistent way:
+   * service. This specially handles data, file and blob URIs so that the
+   * download dirs are recalled in a more consistent way:
    *  - all file:/// URIs share the same folder
    *  - data: URIs share a folder per mime-type. If a mime-type is not
    *    specified text/plain is assumed.
    *  - blob: URIs share the same folder as their origin. This is done by
    *    ContentPrefs already, so we just let the url fall-through.
    * In any other case the original URL is returned as a string and ContentPrefs
    * will do its usual parsing.
    *
    * @param {string|nsIURI|URL} url The URL to parse
    * @returns {string} the domain name to use, or the original url.
    */
   #cpsGroupFromURL(url) {
     if (typeof url == "string") {
+      if (url.startsWith("blob:http://") || url.startsWith("blob:https://")) {
+        url = url.replace("blob:", "");
+      }
       url = new URL(url);
     } else if (url instanceof Ci.nsIURI) {
       url = URL.fromURI(url);
     }
     if (!URL.isInstance(url)) {
       return url;
     }
+    if (url.protocol == "blob:") {
+      if (
+        url.href.startsWith("blob:http://") ||
+        url.href.startsWith("blob:https://")
+      ) {
+        return url.href.replace("blob:", "");
+      }
+    }
     if (url.protocol == "data:") {
       return url.href.match(/^data:[^;,]*/i)[0].replace(/:$/, ":text/plain");
     }
     if (url.protocol == "file:") {
       return "file:///";
     }
     return url.href;
   }