docs: build: Add firefox-esr to test deps

Reported-by: Matthew Vernon <matthewv@chiark.greenend.org.uk>
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/docs/build.rst b/docs/build.rst
index 8cdd1c617cf1a0730dcf8cd8c0804c97815dd2d3..ef464fe5162b550d53c70435be91a517093c299a 100644 (file)
--- a/docs/build.rst
+++ b/docs/build.rst
@@ -28,7 +28,7 @@ Setup
 
 And for running the tests (``make check``) you will need::
 
-     sudo apt install bubblewrap xvfb moreutils
+     sudo apt install bubblewrap xvfb moreutils firefox-esr
 
 
 2. Install Rust.  This is most easily done with rustup_::