SlapBlog

The (now) new Firefox 3.6 and possibly other versions place a 1px border around flash elements embedded with swfojbect. This outline is similar to the active link outline. May occur on other object and embed tags as well.

If you’re  annoyed by this, there is a simple CSS fix.

a:focus, object:focus {
outline: none;
-moz-outline-style: none; [...]