I assume you want access to your friends' emails. You can play it out in court if the judge is favourable with this case: Since Facebook has allowed viewing em

I assume you want access to your friends' emails. You can play it out in court if the judge is favourable with this case: Since Facebook has allowed viewing emails for many years, there's a reasonable expectation that emails will always be there. By suddenly doing attempts to circumvent a tool, they could run afoul of; de facto false advertising (the author stated that the use was allowed since 2010) or anti-trust/monopoly laws by abusing their monopoly against new competition. However, Facebook could whip out their ToS and point out that his extension is illegal as noted buried somewhere deep in the legalese. Or something else. Even though I'm IANAL, this isn't clear cut to me either.