Internet Download Manager
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FireFox Browser Integration

Manual installation of IDM plugin for Firefox and other Mozilla based browsers.
If our add-on is not available in FireFox or other Mozilla based browser, you may need to install it manually. Open FireFox menu and press "Add-ons", see actions (1) and (2) on the picture below.

Press on "Tools for all add-ons" cogwheel (3), and pick "Install Add-on from File..." (4) menu item in the menu.

Then open IDM folder where you installed IDM ("C:\Program Files (x86)\Internet Download Manager\" by default).

Here you have 3 XPI files. They have the same name, but a different number at the end. Select appropriate add-on for your browser basing on FireFox version that is used in it. Please look carefully at the following:
     Select idmmzcc3.xpi for FireFox 53 and newer versions.
     Select idmmzcc2.xpi for FireFox browsers from version 27 to version 52 inclusively.
     Select idmmzcc.xpi (without a number) for FireFox versions from 1.5 to 26.

If you do not know on which version of FireFox is based your browser, try to install all these add-ons one by one.

If you selected the right version, the FireFox would show a dialog confirming setup. Press on "Install" button:

If you selected an incorrect version of XPI file, FireFox would show an error message.