The browser.newtab.url pref is no longer supported in Firefox 41 and later.

You can look at this extension to set the new tab page:

• New Tab Override: https://addons.mozilla.org/firefox/addon/new-tab-override/

You can set the new tab URL setting via the Options/Preferences of the extension on the about:addons page.

You can check the browser.newtab.url on the on the about:config page to find the URL of that extension.

Just a note to add that we are assuming SuperStart is a web page. If it's an add-on, then the steps may be different.

Here are couple screen shots illustrating the steps you take after installing New Tab Override:

Open the Add-ons page using either:

• Ctrl+Shift+a (Mac: Cmd+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Extensions. Then on the right side, find New Tab Override and click its Options button. (See first screen shot attached.)

Depending on the height of your screen, you may need to scroll down to enter the desired address into the form. (See second screen shot attached.) For example:

• Page thumbnails (default) => about:newtab
• Blank tab => about:blank
• Built-in Firefox home page => about:home
• Any other page => full URL to the page

Then tab or click away from that form field and you can test using Ctrl+t.

Success?

Once you have it set the way you want, you can close the Add-ons page (or use the Back button to return to the Extensions list from that Options page).

If you are using the Super Start extension - https://addons.mozilla.org/en-US/firefox/addon/super-start/ - please read the user Reviews for info about how other users have 'fixed' it for the change made in Firefox 41. IMO, that extension needs to be updated by the Super Start developer, rather than have users struggle to configure it properly.

Hi constantinz, could you post back with which fix worked for you? The reviews seem to mention several different things:

(1) Use about:config to set extensions.superstart.set.browser.newtab.url to true, then Exit out of Firefox and start it up again. One review mentions ALSO setting the old browser.newtab.url to about:superstart but another reviewer doesn't mention having to do that.

(2) " If you're using Classic Theme Restorer go to it's settings, in Tabs (1) section check the box beside "Custom new tab page url" and set it's field as about:superstart "

(3) If you install the New Tab Override extension (mentioned earlier in this thread), you can set the new tab page to about:superstart on its Options page.

https://addons.mozilla.org/firefox/addon/super-start/reviews/

Or was it something else? Thanks.

For me the solution has been to install the New Tab Override extension (mentioned earlier in this thread: https://addons.mozilla.org/es/firefox/addon/new-tab-override/?src=cb-dl-recentlyadded). After that, in the Preferences of this Add On you can set the new tab page to about:superstart