Please read carefully the following terms if you use "Sage++ (Higmmer's Edition)" [this software]. To use this software, you must clearly understand and agree with these terms. If you don't agree, DO NOT USE this software.
You accept this software may contain known or unknown bugs, defects or vulnerabilities.
You understand possible threats caused by vulnerabilities of this software. (→Reference)
You know concretely how to protect yourself against vulnerabilities of this software. (→Reference)
You manage by yourself if you cannot get support, updates or fixes of this software due to some kind of situation.
You cope at your own risk with any kind of damages, losses or mental pains etc caused by using this software.
At first, uninstall the following ones if you've already installed: the official Sage, Sage-Too and their derivative add-ons; Sage++ 1.3.10 or earlier. You cannot overwrite-install because the GUID has been changed.(*)
Click the appeared XPI file link.
If you see the message "Firefox prevented this site..." on the notification pop-up box, click [Allow].
Click [Install Now] in the "Software Install" dialog.
Restart Firefox to finish installation.
(*) Your configuration will be lost when migrating from the official Sage 1.4 or later.
** After installing successfully, you can update it automatically through auto-updating system of Firefox.