Hi, you might have been using an add-on that has stopped working, because Firefox doesn't open links in a new tab by default. You can right click > Open Link in New Tab, click the mouse wheel or hold down Ctrl when you click the link. You can also try -

• https://addons.mozilla.org/en-US/firefox/addon/tap-to-tab/ (Also works with double click)!
• https://addons.mozilla.org/en-US/firefox/addon/open-link-with-new-tab/

If you want only bookmarks to open in a new tab, type about:config into the address bar, press Enter, accept the warning, scroll down the alphabetical list to browser.tabs.LoadBookmarksInTabs and double click the entry to change 'Value' from False to True.

If your question is resolved by this or another answer, please take a minute to let us know. Thank you!

As some additional background:

The setting "Open new windows in a new tab instead" instructs Firefox what to do if the link you clicked was coded with either of these optional features:

• "target" attribute directing the link to a new window
• script launching a new window using window.open()

Firefox will open ordinary links -- links that do not have either of those codes -- in the same tab. That setting doesn't apply unless there is a new window.

I have Firefox set up to open all links in a different tab. But I did find the issue. I was logged in under a different name, and that name had different settings.

Thank you for your help.

For Firefox 60.0.1 >

Type about:config into the address bar and hit enter. Accept the warning.

Then search for browser.tabs.loadBookmarksInTabs and set it to true.

Then when you click on a bookmark it will automatically open in a new tab.

HTH