What software won't run in 34? Firefox 32 is no longer supported or secure, so it shouldn't be run. But we can help you make sure your software will run in 34, since most shouldn't be impacted by the update.

Dashlane 1.9.2 won't run on Firefox 34. Dashlane support recommended that I "downgrade" to Firefox 32.

Update Dashlane. Firefox 32 is not secure and you should not use it for daily use.

See this Dashlane support article. http://support.dashlane.com/customer/portal/articles/390903

"If Firefox says that Dashlane is incompatible but you're using the latest public release of Firefox, don't worry. You just have to upgrade Dashlane!"