Internet Download Manager for Windows is a tool that helps users speed up and manage downloads. Among its features is an extension it automatically asks you to add to your browser to integrate the two programs. Sometimes this extension fails to install properly in Firefox or update when you upgrade IDM or Firefox. When this happens, you must remove the old extension, if possible, to force Firefox to automatically add the new version from your most recent IDM software download; or manually download and install the most recent version to force the replacement of the existing version.

Add IDM Through Automatic Update

Step 1

Click the “Firefox” button on the Mozilla Firefox user interface and select “Add-ons” to open the Firefox Add-ons Manager in a separate tab.

Step 2

Select the “Extensions” option and then look for the “IDM CC” extension on the list of previously added extensions. When you find it, click the “Remove” button.

Step 3

Click the “Restart Now” link, or close Firefox and reopen it. Firefox should automatically reinstall and enable the Internet Download Manager extension.

Step 4

Check the Extensions list in the open Add-ons Manager to confirm a successful installation.

Add IDM Through Manual Installation

Step 1

Click the Internet Download Manager’s Firefox Browser Integration Manual Installation link in the Resources section.

Step 2

Click the “Install” button on the page and then click the “Allow” button when prompted. Firefox opens the Software Installation dialog box.

Step 3

Click the “Install Now” button. Wait for Firefox to install the extension and then click the “Restart Now” button that appears in a popup alert bubble below a green puzzle piece icon near the upper left corner of the browser in front of the address bar.

Step 4

Select the Add-ons Manager tab and check that the "IDM CC" extension is enabled on the Extensions list.