Hi, it's likely that you were using an unsigned version which is no longer supported, so please try this signed Yahoo Toolbar add-on instead.

If your question is resolved by this or another answer, please take a minute to let us know. Thank you.

Add the signed Yahoo toolbar per above but youi have to keep doing this after you close the browser!

yes come on -- i want my yahoo toolbar back on! ridiculous that I have to reinstall it every time i close my browser - PLEASE FIX THIS!!!!

still not working and i've tried everything! please fix it. i'm challenged enough as it is!

Hi, please make sure that you remove the unsigned version before installing the new one. Add-ons Manager (Ctrl+Shift+A).

sorry, still doing the same thing. please help!

Hi again, sorry you are having so much trouble with this. It now seems that this is a bug, and the engineering team is currently working with the folks at Yahoo to get this fixed.

thank you so much for helping! i know a number of people have been reporting this over the weekend, and some of them have been pretty ugly. that is so unnecessary. but it is just so frustrating to try to find the right button to report a problem. thanks again!

http://www.ehow.com/how_8407687_uninstall-mozilla-firefox-updates.html

I installed the previous version of Firefox, before this update and selected DO NOT UPDATE-

This is what I could find on the net:https://addons.mozilla.org/en-US/firefox/addon/yahoo-toolbar/

But I have to keep adding it every time I close the browser!

socal, i don't know how to do that. ew1, yeah, that seems to be a problem too. i got a message today that yahoo was made aware of the problem, and is working on it... hope it is soon! i just didn't close my browser last night. hope that isn't a CYBER CRIME!

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The Yahoo toolbar add-on becoming disabled in Firefox 43 is a known issue that Mozilla and Yahoo are working on. In this particular case you can follow the instructions for advanced users in the Add-on signing in Firefox article (toggle the xpinstall.signatures.required preference to false in the Firefox configuration Editor) but this is only a temporary solution which will no longer work in Firefox 44 future Firefox versions.

To others reading: Replies to this thread are supposed to be for helping rkitty1 (the "Question owner"). If anyone else needs help you'll need to ask your own question. See Mozilla Support rules and guidelines.

marked as solved using the current "best solution" locking this thread

Followup: There's been an update to the Yahoo toolbar add-on that resolves the problem. If you have set the xpinstall.signatures.required preference to false in the Firefox Configuration Editor (about:config page) as a workaround, you can go back now and reset the preference to true.