Every time I start up FireFox I get an "Unresponsive Script" message, is there any way to fix this as it's slowing down everything

Here's the message I get:
"A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.
Script: file:///Applications/Firefox.app/Contents/MacOS/components/nsBrowserContentHandler.js:291"
I've tried deleting firefox and re-downloading and installing it but it's no help.

Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all your 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")

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Every time I start up FireFox I get an "Unresponsive Script" message, is there any way to fix this as it's slowing down everything

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