It's still available. But you have to update the browser to 66.0.4 first.

updated firefox to 66.0.4 Still can not download Adblock plus

rsharonh said

updated firefox to 66.0.4 Still can not download Adblock plus

Hi rsharonh, there may be some glitches with the addition of the new certificate in Firefox 66.0.4.

First, can you check whether it got installed? We'll look on the Options page:

• Windows: "3-bar" menu button (or Tools menu) > Options
• Mac: "3-bar" menu button (or Firefox menu) > Preferences
• Linux: "3-bar" menu button (or Edit menu) > Preferences
• Any system: type or paste about:preferences into the address bar and press Enter/Return to load it

In the search box at the top of the page, type cert and Firefox should filter to the Certificates section. Click the "View Certificates" button.

In the Certificate Manager dialog, click the "Authorities" tab. This is listed in alphabetical order by "issuer." Scroll down to where "Mozilla Corporation" should be. Is it there? I am attaching a screenshot for comparison.

If the certificate did not install:

Do you use a Master Password?

For some reason, having a master password can cause a problem if it has not been updated since Firefox 55 or earlier. You can change the password and re-save it as a workaround. Then clear the flag indicating to Firefox that you already got the update so it tries again. Here are the details:

(1) Change your Master Password

You can change the Master Password from itself to the same thing again. See the last section of this article entitled "Changing the master password": Use a Primary Password to protect stored logins and passwords

(2) Reset a preference

This preference is set when the new certificate is inserted, and prevents it from being done again. We need to check whether it was added and, if it was, switch it off.

(A) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful or accepting the risk.

(B) In the search box above the list, type or paste signer and pause while the list is filtered

(C) If the extensions.signer.hotfixed preference is bolded and "modified" to true, double-click it to set it to false

If you do not have that preference, great, no need to create it.

(3) Exit and restart Firefox and see whether it adds the certificate this time

Any luck?