There's a hidden pref, `browser.urlbar.searchTips.test.disableChecks`, up for review in bug 1614651. If/Once that lands, you can set that pref to `true` and an onboarding tip will be shown every time you open about:newtab. Fwiw, the redirect tip will also be shown every time you open your default search engine's homepage provided it's one of Google, Bing, or DuckDuckGo.
Bug 1606923 Comment 14 Edit History
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There's a hidden pref, `browser.urlbar.searchTips.test.disableChecks`, up for review in bug 1614651. If/Once that lands, you can set that pref to `true` and an onboarding tip will be shown every time you open about:newtab. Fwiw, with that pref on the redirect tip will also be shown every time you open your default search engine's homepage, provided it's one of Google, Bing, or DuckDuckGo.