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When I access Yahoo E-Mail through Firefox, the mail window is unreadable and stuffed to the left side of the Firefox window. This just began. When I access the mail through IE, it comes up just fine.

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Everything about Firefox is fine until I click on Yahoo! and go to my email. Then, the "Inbox" window is tiny and unreadable.

Everything about Firefox is fine until I click on Yahoo! and go to my email. Then, the "Inbox" window is tiny and unreadable.

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Are you opening Yahoo mail from a bookmark?

Opening in the Sidebar is the default action for bookmarks that are created via a "Bookmark this Page" link or button on a website. Make sure you use the many "Bookmark this Page" methods that are in Firefox instead.

Right-click that bookmark and select Properties, then un-check the preference for Load this bookmark in the sidebar, and then click Save.