The Emacs SRFI browser now supports the 'k' key to narrow the list of
SRFIs by keyword. This is equivalent to filtering by keyword on the
<https://srfi.schemers.org> web front page.

Pressing 'k', it asks for a keyword in the minibuffer. For example,
entering "R7RS Large" shows only the R7RS-large SRFIs. Press TAB for
completions. Give blank input to reset the filter and show all SRFIs.
The keyword filter can be combined with the free-text search.

Upgrading to the latest version of the MELPA package
<http://melpa.org/#/srfi> gets this feature.