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When will developers fix the non support of Sumble Upon?

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The older version of Firefox ran Sumble Upon just great. Your newer version states "your version of Firefox does not support Sumble Upon". I use this function quite frequently and am very disappointed that it is not longer there. Even tried to go back to earlier version of Firefox but every time I try to download it, the download fails. Next move will be to discontinue using Firefox and go to Google Chrome of Chromium.....Hope you guys/gals will get on this bug right away as I am sure that there will be many others just as disappointed as I am. Thanks

The older version of Firefox ran Sumble Upon just great. Your newer version states "your version of Firefox does not support Sumble Upon". I use this function quite frequently and am very disappointed that it is not longer there. Even tried to go back to earlier version of Firefox but every time I try to download it, the download fails. Next move will be to discontinue using Firefox and go to Google Chrome of Chromium.....Hope you guys/gals will get on this bug right away as I am sure that there will be many others just as disappointed as I am. Thanks

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Have you tried their new add-on? Both are listed here: https://addons.mozilla.org/firefox/user/sumozbar/