This document will expire and need to change over the years but the core take away to keep here will be the strategy to minimize impact to end Users.

Trend Micro made a good list of browsers regarding deactivation of TLS 1.0. 

View browser archives to download older versions to test,

https://ftp.mozilla.org/pub/firefox/releases/ 22 (June 25, 2013) and below does not support TLS 1.1. Sales Force breakdown of browser support for TLS 1.0 and 1.1.

Results of TLS 1.0 testing on major sites,

Website	TLS 1.0	TLS 1.1	TLS 1.2	Date Checked YYYY-MM-DD	Notes
www.google.com				2018-10-16	Google has indicated it has no intention of dropping TLS 1.0 near term (~ Oct 2018 ... to check emails exact date).
www.canada.ca				2018-10-16
www.cibc.com				2018-10-16
www.rbcroyalbank.com	No	No		2018-10-16
www.tangerine.ca	No	No		2018-10-16
www.td.com				2018-10-16
www.bmo.com	No			2018-10-16
www.scotiabank.com				2018-10-16

Record of Tests,