Why would a javascript file's Toggle Line Breakpoint option be grayed out?

I am using PhpStorm 4.01 for a project that relies on version 4.07 of the Ext JS library, and the ext-all-debug.js file that comes with it does not allow me to set breakpoints in Intellij. The Toggle Line Breakpoint option in the Tools menu is grayed out, and the margin to the left of the editor is skinnier than in other Javascript files that allow me to debug. Any suggestions as to why this is occurring?

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It looks like you hit 2.5M limit on file size IDE helps you with, larger files are treated as text.
Please change idea.max.intellisense.filesize in idea.properties to larger value


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