In playing with the very nice (thank you!) FITS-file-extension browser and looking at some recent LSST data files, I ran across a couple of places where the following feature would be very useful:

Whenever we are displaying a tabular view of something that may scroll vertically, it would be good to be able to filter the rows by the contents of the columns.

The places this came up today were:

• The right-hand pane of the FITS file browser, in which header contents are displayed - since FITS files often have hundreds or even thousands of headers.
• The column/filter properties dialog in the table viewer - LSST has many tables with hundreds of rows (and WISE has some very wide tables, too). In this latter case, once UCDs are available in the column metadata, it will become very useful to filter on them (enabling, e.g., "show me all the positional columns", "show me all the flux columns").

Other obvious places in the system where this would be helpful include:

• The normal FITS header browser available from the image toolbar "info" button.
• The HiPS properties viewer.

The UI element to allow this should be the same head-of-column filter field that we use in our main table viewer.

If/when we add full-text search/filtering to meet NED's request, it would be appropriate to make this available more or less everywhere, too.