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it depends on the browser and the operating system, most modern browsers run different tabs as a different threads which limits the possibilities to steal the data from another tab. but still it is not totally secure, to be safe you should run different processes not different threads, i.e. run several different instances of the same browser, and use the separate browser profiles. the Incognito mode is an analogue of running a separate browser process with a separate browser profile, but it is not very handy because it removes all history and cookies on close so you will have to login again when you open the incognito window again. I recommend using the different, separate browser profiles for the different websites, i.e. I have one for youtube, another for facebook, another for general browsing (casual googling and this website), another for e-mails.

exactly, everything belongs to the Party, including private data of foreign people who use chinese devices and software. I hope you won't login to your account from that phone, else your password will end up on some chinese server and your email (if you used the same password on email and youtube) will begin spreading SPAM, as there are no cyber laws concerning hacking/spamming in China.

check here: https://habr-com.translate.goog/ru/post/575626/?_x_tr_sl=ru&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp https://habr-com.translate.goog/ru/post/163345/?_x_tr_sl=ru&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp -- if you want to be sure that a random chinese noname phone would not steal your private data nor spend your balance by sending paid SMS's - simply do not buy random chinese noname phones. also "brand name" phones have malware too, so if you want to be completely sure - learn how to flash the bootloader and a custom firmware yourself. I personally recommend LineageOS (simple Android fork, supports a lot of phones https://wiki.lineageos.org/devices/ ) and GrapheneOS (hardcore Android fork with lots of security tweaks, however supports just a few Google Pixels only https://grapheneos.org/faq#supported-devices )

https://aseannow.com/topic/1262213-makers-of-browser-privacy-extensions-fear-the-end-is-near/?do=findComment&comment=17409250

unfortunately having [a minimum of] two browsers installed is a necessity in a modern web because monkeys seem to have to use the most latest newest freshest javascript framework or a feature that works only in the latest Chrome.

almost nobody changes the notification settings to "hide private data", so even a "locked" phone will turn on its screen and show the incoming SMS contents to anyone nearby. just steal the phone with card and you could make purchases online.

not "could", but "will" have a malware. that includes not only smartphones but even "dumb" phones with buttons.

local mobile providers play dirty - their websites' traffic is not free, and their websites are flooded with heavy images and other media elements, so when your data package finishes and you open a provider's website to login, top up and buy another package, they will charge you around 30 thb for all that media sh.t to load.

Do you know anyone working at ISPs as a network engineer/sysadmin? I'm currently experiencing big problems with AIS but would love to get contacts for other providers too, just in case. I need real technical support who knows what "traceroute" or "BGP" is, not the usual telephone girls "please try to reboot your router ka"