Before I remove system apps, I'd like to ask.

Hello!

I'm a very new Android user. Please, forgive me if I say or ask stupid things. Thank you for the patience in advanc. 😇

I've bought a NAVON Raptor 3G4GB tablet device with Android 5.1 system.
At the first time I tried to download the updates. Few minutes later the system said that the storage is full, and the downloading had stopped. ( 1.20 GB internal storage. )
I disabled, and uninstalled updates, and moved to SD card with many things I was able to. But, I still have just 6% free space and some important update still in queue.
¶ Web Browser System.
¶ Gmail
¶ YouTube
¶ Anti virus app.

So, I'd like to remove some apps, which I don't need. But, before I remove them, I'd like to ask here that do they safety removable apps or any of them could break the system if I removed it.
¶ Cloud Print - v. 1.7b
¶ Google App - v. 4.6.19.arm
¶ Google Play Book - v. 3.4.9
¶ Google Text-to-speech engine - v. 3.4.6.1819666.arm
¶ Google+ - v. 5.6.0.94508375
¶ Hangouts - v. 3.3.94322993
¶ Maps - v. 9.9.0
¶ Messaging - v. 5.1-1445407383
¶ Photos - v. 1.0.1.94954577
¶ TalkBack - v. 4.2.0

I'm going to make rooted the system by 'King Root' app, and remove system apps by 'System App Safe Remover'. I hope they'll work as I saw in a YouTube video guide.
P.S. I'd like to ask that does the Firefox better than the default 'Browser'? If yes, then I can remove the default 'Browser' app without system break or not?

Thank you the comments and answers inadvace. ☺
Sincerely, Atlaimond

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