Firefox

Some useful options for about:config

Preference	Value	Use
browser.newtabpage.activity-stream.topSitesRows	2 (increase as required)	Add more than 2 rows of 'top sites'
network.IDN_show_punycode	true	Show IDNs as xn--.... in the address bar

Addons

Make the background on standalone images properly transparent

• https://addons.mozilla.org/en-US/firefox/addon/transparent-standalone-image/