how to manually set a page when open a new tab
When open a new tab, there's top site suggested by firefox; can we choose it manually, e.g our own proffered sites?
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If you are talking of about:newtab, yes. Mouse on top of the proper icon, you will see a 'lock' and 'remove' at the top.
What I meant is, can we choose which pages we want to appear in that new tab, NOT how to pin and remove it ... right now firefox just chose it for us, based on the history(?). Thanks anyway FredMcD
With Firefox 41 (and higher), it's no longer possible to customize the page shown in a new tab via changing the preference browser.newtab.url in about.config. Because of the fact that hijackers abused the preference in the past, Mozilla decided to remove it (see bug 1118285). Fortunately, by removing it, Mozilla also introduced a new API to bring this functionality back to life as an add-on. This add-on allows the user to choose a certain page in a new tab.
New Tab Override (browser.newtab.url replacement) https://addons.mozilla.org/en-US/firefox/addon/new-tab-override/
This is also available using Classic Theme Restorer (Customize Australis) {web link} Restore squared tabs, appmenu, add-ons bar, small button view and more on Australis UI (Windows/MacOSX/Linux + Fx 29+).