why do i lose my Yahoo Mail seal and color each time I exit or clear history on Firefox? Fine on other browsers.

I have three browsers including Firefox 3.6.28. I am running a Mac Power Book G4 with a OS X 10.5.8

For security purposes, I have installed a "text seal" and "color" on Yahoo Mail. For my other two browsers the text seal and color remain permanent when I quit each but for Firefox, when I delete history or just "quit," the next time I try Yahoo Mail both the text seal and color have not been saved.

Of course, I do not have to use Yahoo on Firefox but I would like to; always have.

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