Changes

* Dialog (optionsType=1) and Inline (2) options were removed in {{bug|1414406}}. Thunderbird will not support that feature any more, only options in tabs (3) work now. Replacements:# If addon's install.rdf contains no <em:optionsType> declaration, the addon's preferences page (<em:optionsURL>) will only be accessible via a new submenu in Tools menu (implemented in {{Bug|1419145}}, landed on Daily 59 as of 2017-12-22). The preferences will open in a dialog, as was the case in older versions.# If addon's install.rdf contains <em:optionsType>3</em:optionsType>, the Preferences button will appear in the Add-on Manager tab besides the addon, as was the case in older versions. Clicking the button will open the preferences page in a new tab. The preferences page (optionsURL) is also accessible via the new submenu in Tools menu and will open in a tab. No other value of <em:optionsType> is supported and TB will even refuse to install such addons (decision from {{bug|1414406}}).# Alternatively , add-ons need to may embed a WebExtension to display inline options [https://developer.mozilla.org/Add-ons/WebExtensions/Embedded_WebExtensions][https://developer.mozilla.org/Add-ons/WebExtensions/manifest.json/options_ui]. This should be working now that {{bug|1418914}} has been fixed.