Slashdot has reported:

Mozilla is testing Mini Window, a Firefox Nightly feature that moves an open tab, or a section of one, into a small, always-on-top window with most browser controls hidden. The feature can make a webpage appear like a web app without users having to create one, according to a report by ZDNet’s Jack Wallen cited by Slashdot.

At first, Mini Window shows no address bar, controls, scroll bar or other elements normally associated with Firefox. Hovering the cursor inside the window reveals the address bar, back, forward and reload buttons, along with a close button. The page content remains visible while the browser interface stays out of the way.

The Mini Window stays above other Firefox windows, keeping its content in view while users work elsewhere. Wallen said it could help people working with limited display space, such as on a laptop, who need to refer to one page while using another. For example, someone writing a paper on Linux could keep a relevant article in the mini window and a document in the main window, avoiding the need to switch back and forth, even on a smaller display.

Wallen also described using the feature with MacOS’s Stage Manager, which he said makes only one window available at a time. Mini Window lets him keep the main browser window focused while a page remains open in the separate mini window, bypassing that limitation.

Another use he described is opening a favourite search engine in Mini Window so it is always ready to use. He said the same approach could be used with a favourite AI service. The feature is being tested in Firefox Nightly.