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Since installing FF 43.0.4, yahoo!mail autosuggest/autocomplete no longer works -- it still works fine when I use Internet Explorer as my browser

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Since updating to Firefox 43.0.4 (from FF 43.0) , Yahoo@Mail's "autosuggest/autocomplete" function for email addresses no longer works. It DOES work fine when I use Internet Explorer to access my yahoo mail. What got changed in the update -- what do I need to re-set?

Since updating to Firefox 43.0.4 (from FF 43.0) , Yahoo@Mail's "autosuggest/autocomplete" function for email addresses no longer works. It DOES work fine when I use Internet Explorer to access my yahoo mail. What got changed in the update -- what do I need to re-set?

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I understand that when you compose anew email in yahoo that the contacts no longer autocomplete.

Please update your Adobe Flash version to version 17 and check the settings for interactive web pages:

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I am still using Win xp & have had trouble updating Adobe flash to a new version. I can access my yahoo mail contacts via IE but not FF since yesterday. What changed??