User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:46.0) Gecko/20100101 Firefox/46.0 Build ID: 20160502172042 Steps to reproduce: I read the API documentation for WebExtensions > chrome.bookmarks, https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/bookmarks. Actual results: I did not find any capability to *get* or *set* bookmark Tags. Expected results: Because WebExtensions are slated to replace the Add-Ons SDK, and because bookmarks extensions which sync bookmarks require access to all bookmark attribute, either (1) The chrome.bookmarks API implemented by WebExtensions for Firefox should contain additional functions to *get* and *set* bookmark Tags, or, (2) There should be a link to some Mozilla policy statement which publicly states that bookmark Tags obsolete and will be removed in some future version of Firefox. Note: There is some discussion of the future of Tags in Bug 1225916.