The Firefox WebDAV Launcher is currently not compatible with Firefox 57.0, which is the most recent release as of this case. This release is known as Firefox Quantum.
Do we have plans to release a version of the WebDAV Launcher soon that is compatible with this version of Firefox?
Many users will be upgrading to Firefox 57 Quantum, so it would be helpful to have the extension be compatible with this.
- Do not upgrade to Firefox Quantum as it is listed as not compatible with the WebDAV Launcher: WebDAV Launcher – Add-ons for Firefox
- Use Internet Explorer to 'Edit in Office'
- If you have already upgraded to Firefox Quantam, the following steps will allow you downgrade your Firefox Browser: Install an older version of Firefox