Rated 4 out of 5 stars

Incorrect and frustrating in not closing the last tab with user set "browser.tabs.closeWindowWithLastTab" to false, that option if true is supposed to close Window not just the tab. But set to true should be able to close the tab and not window. AND now (1.14) won't close an app-tab. Use Ctrl+W or tab context menu to close the last tab or an app-tab (or install much larger tab "clicking options"). Can't use with either of these two non-Firefox usages. So forced to use Tab Clicking Options just to close a tab with a double-click. [edited: now using "Double Click Closes Tab" which does what I want]