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Upgraded to 46.0 Fire IE 1.4.6.1 no longer works

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I now have a menu item that looks like a lightning flash instead of Fast or Compatible. Clicking on it does nothing. If I place the cursor over the button it says "Left-Click: Switch rendering engine" Right-Click: Show Fire IE Options. Left click does nothing.

I now have a menu item that looks like a lightning flash instead of Fast or Compatible. Clicking on it does nothing. If I place the cursor over the button it says "Left-Click: Switch rendering engine" Right-Click: Show Fire IE Options. Left click does nothing.

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You should contact the support for that add-on.

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It looks like you are not alone with this problem: https://addons.mozilla.org/firefox/addon/fire-ie/reviews/

If you just need to open pages in IE from time to time, you might try this extension instead: https://addons.mozilla.org/firefox/addon/open-in-ie/