Can't change my new tab page-it appears as "Fast Start" and i can't change it fro about:config page
When I enter about:config page and try to change the new tab settings to about:blank it changes them but when I open a new tab it opens this "Fast Start" and it shows windows with some sites I visit, but there is no option in which i choose if it's this or a blank page. I had this option, I don't what changed.
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Solution choisie
New Tab Override (browser.newtab.url replacement) https://addons.mozilla.org/en-US/firefox/addon/new-tab-override/
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.
FastStart may be a browser hijacker [Malware] that you picked up. See if this helps you. https://malwaretips.com/blogs/remove-fast-start/