2 files changed, 91 insertions, 0 deletions
diff --git a/legacy/BootstrapLoader.sys.mjs b/legacy/BootstrapLoader.sys.mjs
index d28bf22..bd53689 100644
--- a/legacy/BootstrapLoader.sys.mjs
+++ b/legacy/BootstrapLoader.sys.mjs
@@ -336,7 +336,11 @@ return BootstrapLoader = {
       startup(...args) {
         if (addon.type == "extension") {
           logger.debug(`Registering manifest for ${file.path}\n`);
+          try {
           Components.manager.addBootstrappedManifestLocation(file);
+          } catch (e) { // mozilla142+
+          LegacyFoxUtils.addBootstrappedManifestLocation(file, addon, getURIForResourceInFile);
+          }
         }
         return startup(...args);
       },
@@ -349,7 +353,11 @@ return BootstrapLoader = {
         } finally {
           if (reason != BOOTSTRAP_REASONS.APP_SHUTDOWN) {
             logger.debug(`Removing manifest for ${file.path}\n`);
+            try {
             Components.manager.removeBootstrappedManifestLocation(file);
+            } catch (e) { // mozilla142+
+            LegacyFoxUtils.removeBootstrappedManifestLocation(addon);
+            }
           }
         }
       },
diff --git a/legacy/LegacyFoxUtils.sys.mjs b/legacy/LegacyFoxUtils.sys.mjs
new file mode 100644
index 0000000..6d13c2c
--- /dev/null
+++ b/legacy/LegacyFoxUtils.sys.mjs
@@ -0,0 +1,83 @@
+/**
+ * Replacements for Components.manager.addBootstrappedManifestLocation and
+ * Components.manager.removeBootstrappedManifestLocation, which have been nixed
+ * in mozilla142. Copyright 2025 Tobias Girstmair <https://gir.st/>, MPLv2.
+ */
+var LegacyFoxUtils = (function() {
+const ZipReader = Components.Constructor(
+  "@mozilla.org/libjar/zip-reader;1",
+  "nsIZipReader",
+  "open"
+);
+
+const ScriptableInputStream = Components.Constructor(
+  "@mozilla.org/scriptableinputstream;1",
+  "nsIScriptableInputStream",
+  "init"
+);
+
+const FileOutputStream = Components.Constructor(
+  "@mozilla.org/network/file-output-stream;1",
+  "nsIFileOutputStream",
+  "init"
+);
+
+return class LegacyFoxUtils {
+  static addBootstrappedManifestLocation(file, addon, uriMaker) {
+    // read chrome.manifest from .jar (or unpacked addon)
+    let zipReader = new ZipReader(file);
+    let istream = new ScriptableInputStream(zipReader.getInputStream("chrome.manifest"));
+    let manifestContents = istream.read(zipReader.getEntry("chrome.manifest").realSize);
+
+    // replace chrome:// and resource:// URIs with absolute paths to JAR
+    manifestContents = manifestContents
+      .split("\n")
+      .map(absolutizePaths.bind(null, uriMaker, file))
+      .join("\n");
+
+    // we store the temporary file in the user's profile, in a subdirectory
+    // analogous to webExtension's "browser-extension-data".
+    let manifest = Services.dirsvc.get('ProfD', Ci.nsIFile)
+    manifest.append('legacy-extension-data');
+    manifest.append(addon.id);
+    manifest.exists() || manifest.create(Ci.nsIFile.DIRECTORY_TYPE, 0o755);
+    manifest.append('chrome.manifest'); /* created or truncated by ostream */
+
+    // write modified chrome.manifest to profile directory
+    let ostream = new FileOutputStream(manifest, -1, -1, 0);
+    ostream.write(manifestContents, manifestContents.length);
+    ostream.close();
+
+    // let Firefox read and parse it
+    Components.manager.QueryInterface(Ci.nsIComponentRegistrar).autoRegister(manifest);
+  }
+
+  static removeBootstrappedManifestLocation(addon) {
+    let manifestDir = Services.dirsvc.get('ProfD', Ci.nsIFile)
+    manifestDir.append('legacy-extension-data');
+    manifestDir.append(addon.id);
+    manifestDir.exists() && manifestDir.remove(/*recursive=*/true);
+    Cc['@mozilla.org/chrome/chrome-registry;1']
+      .getService(Ci.nsIXULChromeRegistry).checkForNewChrome();
+  }
+}
+
+function absolutizePaths(uriMaker, file, line) {
+  const manifestMethodPathLocation = {
+    content: 2, // content packagename uri/to/files/ [flags]
+    locale: 3,  // locale packagename localename uri/to/files/ [flags]
+    skin: 3,    // skin packagename skinname uri/to/files/ [flags]
+    resource: 2 // resource aliasname uri/to/files/ [flags]
+  };
+
+  let words = line.trim().split(/\s+/);
+  const index = manifestMethodPathLocation[words[0]];
+
+  if (index) {
+    words[index] = uriMaker(file, words[index]).spec;
+    line = words.join(" ");
+  }
+
+  return line;
+}
+})()