When no squint add on activated screen goes blank

I have used no squint for a couple of years with no problem. But the last time I activated it the firefox browser flashed on the screen and then disappeared leaving me with a blank screen. When I uninstalled no squint the screen returned.
Thanks for any suggestions.
Alnwick.

These are what my Global settings are. There are two option panels.
This one is the Global, meaning all web sites. There is also a
per site panel, meaning for that site only.
Either the Global, or per site option may be causing your problem.

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Welcome to Apple Support Communities.
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When no squint add on activated screen goes blank

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