对于我(Firefox 11，Firebug 1.9.1)，有时在我刷新页面(F5 或 CTRL+F5)后，调试器暂停在断点.

For me (Firefox 11, Firebug 1.9.1) it happens sometimes after I refresh the page (either F5 or CTRL+F5) while debugger is paused on a breakpoint.

解决方案似乎是继续执行脚本，并且仅在 Firebug 未暂停时刷新页面.

The solution seems to be to continue the execution of the script, and refresh the page only when Firebug is not paused.