has potential, but it needs work

* simply doesn't work sometimes
* formats can't be re-ordered
* needs to be a section in settings with basic format examples and variable names
* the pop-up doesn't appear unless the icon is on the toolbar

Ver3.0.0からFormat link settingが保存できません。
firefoxのバージョンは 66.0.3.です。
Format link setting can not be saved from Ver3.0.0. The forefox version is 66.0.3.