You might fix it easily by disabling all your extensions / add-ons and then enabling them back one at a time to see which is the issue - we know in recent times ad-block plus has had a negative effect on a few sites.....i'd disable all your plugins apart from any security - none are really needed to view VEF...try running something like malwarebytes adw cleaner
https://www.bleepingcomputer.com/download/adwcleaner/
This tutorial from malware forum bleeping computer 2007 reads like war & peace but it needs to be given there are umpteen reasons why browsers play up
Slow Computer/browser? Check Here First; It May Not Be Malware
https://www.bleepingcomputer.com/for...ot-be-malware/
As they say keep everything up to date
Personal software checker
https://www.bleepingcomputer.com/dow...inspector-psi/