Note to all LabKey developers running automated tests using Firefox ESR:

Firefox ESR 52.2 was recently released. It is the first "qualified" version of ESR 52, so any existing install of ESR 45 might auto-upgrade if you aren't careful. Firefox 45 is, currently, the highest version supported by LabKey's UI test framework.

If you need to re-download ESR 45 if you experience issues using it, please do so here:

https://ftp.mozilla.org/pub/firefox/releases/45.9.0esr/

Look in "<your_os>/en_US" to get the installer.

You may also want to make sure you have auto update turned off (menu preferences/advanced/Update tab)