Yes, It is. Opera is good at saving free space. For example, Chrome used to take at least 600 megabytes of memory, while opera needs 200. At the same time, I did not notice much difference in functionality and speed.

If you are using from the same laptop/Desktop you need not to, until you log out from your device which will be listed in whats app web. If you will log out from there, You need to do it again. Still you can try other types of Whatsapp from alternative app market. If there are some... You will find detailed description anyway.

From security reasons it is recommended to Log out from your device each time you close your whats app web.

Just try another WhatsApp solutions. I hope you may find it some alternatives for your device from any store. If no, just ask me and I will help.

Hello! I'm tired of bugs that arise during working with Opera not to mention that I lost my passwords two times. I know. I am not alone in this question amd I don't ask you to offer me Chrome or other memory-eating browsers.
Maybe someone have found alternative? In addition, can someone recommend me the most stable version of Opera?

Yes, It is. Opera is good at saving free space. For example, Chrome used to take at least 600 megabytes of memory, while opera needs 200. At the same time, I did not notice much difference in functionality and speed.