Research ISO verification using checksum on Chrome

Originally created by @sajolida on #7261 (Redmine)

After the death of MD5 Reborned Hasher it seems hard to find an equivalent extension for Firefox.

Providing instructions for Chrome would be an alternative solution.

At first sight, a bunch of Chrome extension do checksums:

• Crypto Tools: https://chrome.google.com/webstore/detail/crypto-tools-encryptioncr/pbbjnobglkpbfmpabbgogbnlffkmgbii/details
  * quite popular
  * well translated
  * maybe overkill
• SHA1 and MD5 Checksum: https://chrome.google.com/webstore/detail/sha1-and-md5-checksum/ifdcfgpkdlceolbamlkmlbdcffgndkgk/details
  * recent
  * simple
• FileHash: https://chrome.google.com/webstore/detail/filehash/mlfnjicohdcbglkgmdkckpomajahokfo/details
  * simple
• Satori: https://chrome.google.com/webstore/detail/satori/oncomejlklhkbffpdhpmhldlfambmjlf/related
  * complexe
  * we are in touch with upstream: https://mailman.boum.org/pipermail/tails-dev/2014-March/005270.html

Parent Task: #6851 (closed)