To install the APEX Developer Addon you need
or Google Chrome.
At next go to the Download Section, request a Download and wait for the Email.
In the Email you'll find the Download Link
Open the Download Link in the Browser (FF/Chrome) you want to install the Addon.
Please note that the Developer Addon lists a crossrider.com-Domain as originator. This is intentional and doesn't need to worry you.
Please don't forget to report Issues and Feature Requests.
Special Google Chrome Note!
Google recently made the Chrome Browser more "secure" and doesn't allow drag&drop installation of Addons directly anymore. Instead try this:
- Go to the Menu -> Window -> Extensions
- activate "Developer Mode" checkbox in the top right corner
- drag&drop the downloaded .crx-file onto the Extensions Page