@kameshbhai32 hello and welcome to the forum 🙂
Basicly it is that simple if you use Firefox trough libertine - but you have to try only once to understand why it is not reasonable idea (on Ubuntu Touch with mobile device). User experience with UT with desktop Firefox is absolutely torture.
That is the reason why login sync is not that easy to achieve. On Ubuntu Touch you have to have mobile optimized (or convergence) software.
And my post idea was to tell how you can do it with current working software solutions.