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What? Firefox 57 is great, the only add-ons you need for casual browsing are uBlock Origin (Adblock Plus sold out a long time a go and have an acceptable ads program), Smart HTTPS, Local CDN and Neat URL. If for some reason those don't work stick to Firefox ESR 52. The only one's I haven't found replacements for are pretty niche like opening a video stream into an external video player like mpv, SMPlayer ect. For uBlock Origin make sure you enable some 3rd party filters in the dashboard like Ads, Malware Domains, Privacy and Multipurpose.
Apparently it will also not accept any Norton extensions or Trustwave.