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add extension is impossible

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I have the last Firefox version and am trying to add extensions (e.g. video download helper). When I click on Add to Firefox, it works at loading the extension, but without any success. The blue dot in the gray square dances and dances and dances.... Thanks !!

I have the last Firefox version and am trying to add extensions (e.g. video download helper). When I click on Add to Firefox, it works at loading the extension, but without any success. The blue dot in the gray square dances and dances and dances.... Thanks !!
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You need to contact their Addon developer for support for issues using their software.

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Sorry, but it doesn't solve my issue, as all extensions behave the same way : I can't add them.

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What OS? I have no issues with install. see screenshot

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I am under MacOS Sonoma 14.5, and my Firefow version is 133.0.3.

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