While downloading add-ons error message - unable to download . want ad blocker urgently

while installing add-ons error message appears
" theree was an error downloading ...."
This happened will all addons i tried within 2-3 seconds of clicking on install

Check to see if installations are allowed in Firefox
*Go to <code>about:config</code> like you were going to a website
*Press the button saying you'll be careful
*Search for <code>xpinstall.enabled</code>
*The value of <code>xpinstall.enabled</code> should bet set to TRUE. If it's FALSE, right click it and select Reset.
What exact error is it giving you?<br>
Try these fixes from this article
*https://support.mozilla.org/en-US/kb/unable-install-add-ons-or-extensions

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