Hi @Manish Chokwal,
I am having the exact same issue, however I am using Brave browser not firefox, this started maybe a week or two ago and is happening on every single login that is in Enpass. Is this still an issue? or is it supposed to be fixed by now? I installed Enpass via my package manager maybe 2 years ago and it has been working perfectly fine up until recently.
After testing, the issue is NOT occurring in Firefox or Chrome - however Brave is the only browser that I use.
Brave Version 1.43.93 Chromium: 105.0.5195.127 (Official Build) (64-bit)
Manjaro Linux 22.0.0 Kernel 5.19.7-1
Enpass Version: 6.8.1 (1063)