How can I remove Telegraph from Firefox address bar suggestions?

• Go to about:config in the address bar
• If required, click the "Accept the Risk and Continue" button
• search for: "sponsored"
• To toggle an a value to false, double click it

I would recommend trying

browser.newtabpage.activity-stream.showSponsored

browser.newtabpage.activity-stream.showSponsoredTopSites

browser.urlbar.sponsoredTopSites

If that didn't work, then:

• Make sure telegraph.co.uk is not in your bookmarks and not in your history and not in your open tabs
• In the menu, go to Settings
• Click on Privacy & Security on the left hand side
• Scroll down to the Address Bar section
• Unselect "Shortcuts"
• Unselect "Top Sites"