You can talk about issues with k-meleon here.
Right-clicking near bottom makes menu disappear
Date: December 01, 2000 12:33PM
Right-click near the bottom of the page. That's up and down, don't move the mouse. The menu will disappear the second you release the mouse button - as the browser is getting focus.
The menu needs to popup a pixel or two below where it is currently.
RE: Right-clicking near bottom makes menu disappea
Date: December 02, 2000 07:35PM
Also, the menu should really come up on mouse up, not down.