Light on memory footprint: the smallest RAM amount used among all the modern browsers. Fastest application startup. Very responsive. Invaluable on the older and low-end hardware.

Almost every detail can be personalized:

• skin
• buttons (icon theme and on/off state)
• toolbar placement
• menus
• number of settings and preferences
• proxies (add and switch with ease)
• locale (switch on the fly without downloads and restarts)
  etc.

К-Meleon is distributed in 7zip-archived packages mainly now. You can just unpack it somewhere (even on USB-drive, flash or memory card) and run from there.

No malware/adware toolbars/extensions can be injected. You can switch off Java, JS, Flash, popups, and Ads from the toolbar or with a hotkey.

Has hundreds of its native extensions written on its own macrolanguage.
Supports dozens of XPI-extensions for Firefox.