New
#11
It's 100% verified that LastPass was the culprit. After a day of testing and use the issue can be duplicated and eliminated at will. Wish I hadn't inadvertently overlooked it during the troubleshooting process. Interesting how whatever "upgrades" that were being made incrementally to LasPass first reared its head with Firefox then over time progressed to the other browsers, each being debilitated at differing rates until they were all rendered useless when using just that one site.
Thanks again for the replies to what was my dilemma. Aside from no longer having an issue I've also come away smarter with new (to me) software insights and usages.