You can turn that off easily enough from the Firefox settings.

#fxhelp

@gotofritz This support article might help:

https://support.mozilla.org/en-US/kb/search-open-tabs-firefox

#fxhelp

@Brahvim Hi. This support article might help you to turn this off:

https://support.mozilla.org/en-US/kb/firefox_suggest_mobile

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@ml I recommend heading over to support.mozilla.org. The team there may ask for some crash reports, but may be able to help find a solution for you.

#fxhelp

@cmeerbeek This is something that we are aware of and are looking into.

#fxhelp