A quid is a slang term for the British pound. So currently, 1000 quid (or 1000 pounds) is about $1500 US dollars.
Sidebar is a theme feature introduced with Version 2.2. It's basically a vertical column provided by a theme for displaying information other than the main content of the web page. Themes usually provide at least one sidebar at the left or right of the content.
DevTools UI Elements: Panels and Sidebar Panes. 1  A panel is a top-level tab, like the Elements, Sources, and Network panels.  A sidebar pane presents supplementary UI related to a panel. The Styles, Computed Styles, and Event Listeners panes on the Elements panel are examples of sidebar panes.