+ jarEntry;
    let filePathResponse = await fetch(filePath);
    let fileContents = await filePathResponse.blob();
    let fileData = await new Promise(resolve => {
      reader.onloadend = function () {
        resolve(reader.result);
      };
      reader.readAsArrayBuffer(fileContents);
    });
    await IOUtils.makeDirectory(installToDirPath);
    // Do not extract into directories. Extract all files to the same
    // directory.
    let destPath = PathUtils.join(installToDirPath, fileName);
    await IOUtils.write(destPath, new Uint8Array(fileData), {
      tmpPath: destPath + ".tmp",
    });
    // Ensure files are writable and executable. Otherwise, we may be
    // unable to execute or uninstall them.
    await IOUtils.setPermissions(destPath, 0o700);
    if (IOUtils.delMacXAttr) {
      // If we're on MacOS Firefox will add the quarantine xattr to files it
      // downloads. In this case we want to clear that xattr so we can load
      // the CDM.
      try {
        await IOUtils.delMacXAttr(destPath, "com.apple.quarantine");
      } catch (e) {
        // Failed to remove the attribute. This could be because the profile
        // exists on a file system without xattr support.
        //
        // Don't fail the extraction here, as in this case it's likely we
        // didn't set quarantine on these files in the first place.
      }
    }
    extractedPaths.push(destPath);
  }
  return extractedPaths;
}

onmessage = async function (msg) {
  try {
    // Construct a jar URI from the file URI so we can use the JAR URI scheme
    // handling to navigate inside the zip file.
    let jarPath = "jar:" + msg.data.zipURI + "!/";
    let installToDirPath = PathUtils.join(
      await PathUtils.getProfileDir(),
      ...msg.data.relativeInstallPath
    );
    let extractedPaths = await readJarDirectory(jarPath, installToDirPath);
    postMessage({
      result: "success",
      extractedPaths,
    });
  } catch (e) {
    postMessage({
      result: "fail",
      exception: e.message,
    });
  }
};
PK