Still trying to nail down the WordPress load hangs in Firefox…can’t seem to pin it down.

However I decided to clean up the back end database by deleting old post revisions and optimizing the table.

Using phpMyAdmin, I performed the following query:
delete from wp_posts where post_type=’revision’;

Then I disabled the option in wp-config.php by adding the following line:
define(‘WP_POST_REVISIONS’, false);

Lots of other nifty options to do with tweaking WordPress via wp-config.php can be found on the codex.