What is a "sidebar"?

[anselmschueler]

NoScript sometimes shows domains with a "(sidebar?)" note next to them. On hover this is explained as "Site outside of a content tab, e.g. in a sidebar". What does that mean? I understand "outside of a content tab" to perhaps mean content not loaded in the visible site, e.g. a service worker, an iframe, or something? But what is a "sidebar"? Is NoScript checking <nav> elements separately? Surely not.

[barbaz]

Sidebar is a Firefox feature where some content can be displayed in a separate area to the left of the browser area. You can for example open the Firefox-builtin Bookmarks sidebar with Ctrl-B. For more detailed info see https://support.mozilla.org/en-US/kb/us ... tical-tabs

Extensions can load content in the sidebar too, and that extension-loaded content can load resources in ways that subject to NoScript's script blocking. These domains are being surfaced in the NoScript popup as the only way NoScript has to notify you about this blockable active content.

Are you seeing "(sidebar)" domains listed in the NoScript popup when you don't have any extension's sidebar open? If so, what version of NoScript are you running, and if it's not latest development build see viewtopic.php?t=27296 ?

[anselmschueler]

I have a sidebar open, but only the new "vertical tabs" feature, which to me seems like it shouldn’t be loading any content (except favicons).
But that’s probably what’s going on.