ARIA Landmark Inspector Bookmarklet
When evaluating a page for accessibility and its use of ARIA, it's helpful to quickly see if any aria-label or aria-labelledby attributes are being used to provide additional descriptions for ARIA landmark regions. This tool will let you quickly see that information.
To get the tool, add the following link to your bookmarks.
When you are viewing a page, click the bookmark to reveal the ARIA landmark roles, and any labels attached to those roles. The property of the attribute "label" will display as "Label:" and the target of the "labelled-by" attribute will display as "Labelled By:". If you click the bookmark a second time the page will be restored to its original condition.
Here is a sample page to experiment with this tool.