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Add-ons and older versions of Firefox ESR may enable your users to run legacy add-ons and view websites that require Internet Explorer.

=Overview= The Legacy Browser Support extension allows Windows users to maintain compatibility with websites that use legacy technologies while using Firefox as a primary browser. Once defined through policy or the Enterprise mode site list, users can automatically open a predefined set of URLs in Internet Explorer and switch back to Firefox when navigating to a different domain. To ensure that the Legacy Browser Support extension will work properly, run the dedicated installer, install the extension and install the templates. =Configure Firefox to install the legacy browser support extension= * Details on how to install extensions can be found [https://github.com/mozilla/policy-templates#extensions here]. * The Legacy Browser Support extension can be found [https://addons.mozilla.org/en-US/firefox/addon/legacy-browser-support/ here]. [[T:addonsupport]] =Run the dedicated installer= Use your software management tool to run the dedicated Legacy Browser Support MSI installer. 32 ([https://github.com/mozilla/legacy-browser-support/releases/download/v1.0/setup.msi link]) and 64 bit ([https://github.com/mozilla/legacy-browser-support/releases/download/v1.0/setup64.msi link]) versions of the installer are available. =Install the templates and provision the IE Enterprise Mode Site list (optional)= Instructions regarding how to provision the IE Enterprise Mode Site list can be found [https://docs.microsoft.com/en-us/internet-explorer/ie11-deploy-guide/turn-on-enterprise-mode-and-use-a-site-list here]. The ADMX templates for Firefox are available for download [https://github.com/mozilla/policy-templates/releases here]. Please note that ADMX templates should be added to the X:\Windows\PolicyDefinitions directory and customized per your deployment configuration: # List the URLs that should be opened in the alternative browser. # Customize the behavior of the extension: #;* '''Alternative Browser Arguments''': none #; Use this to enter command line parameters if necessary. See the documentation included with the ADM templates for more information. #;* '''Alternative Browser Path''': ${ie} #;* '''Firefox Arguments''': none #;* '''Firefox Path''': ${firefox} #;* '''Hosts to Open In Either Browser''': none #; Specify a URL greylist by including the URLs that shouldn’t exclusively open in one browser or the other, such as a Single sign-on page, if necessary. For more information, see the documentation included with the ADM templates. #;* '''Hosts to Open In the Alternative Browser''': enter the URLs to redirect. '''Here are some notes that you should reference''': * The URLs you specify in the policy take precedence over the Internet Explorer site list if you provision URLs through both. * The latest information on our policies and more details about specific policies are available in the README within our GitHub repository: [https://github.com/mozilla/policy-templates/blob/master/README.md https://github.com/mozilla/policy-templates/blob/master/README.md]. * Reference the following Github repository: [https://github.com/mozilla/legacy-browser-support/releases https://github.com/mozilla/legacy-browser-support/releases].