Running Firefox 10.0.2, cannot add new search engines from Mycroft Project. Error message: "you will need a browser which supports opensearch to install this plugin" Please help with steps on how to fix this issue in Firefox, thank you

Can't add new search engines from Mycroft Project in FF 10.0.2. Error message states: "you will need a browser which supports opensearch to install this plugin"

You're welcome.
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
*Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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