It is possible that these extensions aren't signed properly.

Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?

https://www.alexa.com/toolbar?browser=firefox

does firefox his new policy preventing addons form third party sites form installing ?

cor-el said

It is possible that these extensions aren't signed properly. Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?

https://www.alexa.com/toolbar?browser=firefox

does firefox his new policy preventing addons from third party sites from installing ?

No problems here with installing the Alexa Toolbar for Firefox. Maybe your security software is blocking it.

Try to save the file via the right-click context menu.

It is possible that (anti-virus) security software is causing the problem. Try to disable security software temporarily to see if that makes a difference.

cor-el said

No problems here with installing the Alexa Toolbar for Firefox. Maybe your security software is blocking it. Try to save the file via the right-click context menu.

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It is possible that (anti-virus) security software is causing the problem. Try to disable security software temporarily to see if that makes a difference.

thank for your help

it was bitdefender encrypted web scan setting i just disable it and it worked

I disabled all of Bitdefender, but I still got the same error message and the update is still not installed.