This is a cloned version of an well-known ancient addon "IE View", based on WebExtensions APIs. This works on Firefox 57 and later also, but requires its own binary module. Before you install this to your Firefox, you need to install the native messaging host by these steps: 1. Download the MSI suitable for your environment's architecture, or a zip package "ieview-we-host.zip" from https://github.com/clear-code/ieview-we/releases/latest 2. If you've downloaded an MSI, run it to install. Otherwise, unzip the downloaded file and double-click the batch file named "install.bat". 3. Install this "IE View WE" Firefox addon. IMPORTANT NOTE: The list of URLs which should be opened by IE is not compatible to the legacy version's one. You need to rewrite them based on the matching pattern spec for Firefox addons. For example:"http://example.com" => "http://example.com/*" (note that the added wild card to match any page under the domain.) For business use, this addon supports managed storage (Firefox 57 and later) to provide fixed configs by the system administrator. See also storage.managed and the sample manifest file. Moreover , this includes ability to read preferences from MCD's configuration file. If your MCD configuration file includes definitions of following preferences, they are automatically imported: * "extensions.ieview.ieapp" (String, path to IE's executable file) * "extensions.ieview.ieargs" (String, extra arguments for IE) * "extensions.ieview.forceielist" (String, a list of URLs) * "extensions.ieview.disableForce" (Boolean) * "extensions.ieview.contextMenu" (Boolean) * "extensions.ieview.debug" (Boolean)