Hello Melzer, please delete the extension and download it again : https://addons.mozilla.org/en-us/firefox/addon/new-tab-override/

any luck ?

@I have a screen shot but for some reason cannot upload it

sorry, none of us can upload a screenshot in the main question :(, you can do only if you reply in your question :-)

than you

The options page is really long, so you may need to scroll down. Here's what it looked like last year for reference.

This page has changed since I last tested it, so please ignore the screenshot.

Okay, I tested again. The Options page for New Tab Override is a little glitchy. If you switch the extension's status from disabled to enabled on that page, you need to reload the page (Ctrl+r) to show the last two lines. You can use Ctrl+Shift+r to bypass the cached version if Firefox isn't refreshing the page normally.

Ideato - I tried removing and re-installing. Same problem.

jscher2000 - I've tried your steps and I'm getting the same result.

I definitely think I'm doing something wrong but have no idea what! It's probably something simple. I've attached my screen shot so you can see what I see.

I've done this successfully in the past. Feeling frustrated.

If all else fails, try going through the back door:

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

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

(3) If the extensions.newtaboverride@agenedia.com.type preference is bolded and "user set" to something other than custom_url, right-click > Reset it to custom_url

(4) Double-click the extensions.newtaboverride@agenedia.com.url preference and enter the desired URL (perhaps easiest to copy/paste it from the address bar on the actual page to avoid typos)

Does that work?

jscher2000 - Unfortunately this hasn't worked either.

It seems (for your system details) that you are in permanent private browsing mode browser.privatebrowsing.autostart is TRUE, any luck if you change it to false ?

ideato - Sorry, I'm not savvy when it comes to this. Where do I locate my browser settings in order to try making that change?

Hi Melzer, you can switch it here:

"3-bar" menu button (or Tools menu) > Options

In the left column, click Privacy. Then on the right side, change to "Firefox will: Use custom settings for history" and uncheck the box for "Always use private browsing mode"

jscher - thanks for the clarification, I've followed these steps, I'm still not able to use new tab override.

I'm at a loss :(

Hi Melzer, some older "full themes" can break various aspects of the Add-ons page, but it doesn't seem that you use such a theme, so I can't figure out why those fields are not displayed.

I also can't think of a reason that the extension itself is failing to implement the settings in about:config.

So is Firefox displaying its own internal about:newtab page in a new tab or is something else appearing there?

There is a rather obscure way to override the page using an "autoconfig" file -- a script you copy into Firefox's program folder -- but it's been a long time since I read the details so I'd have to search around for it if you wanted to try that.