Since I've seen a lot of chatter about people switching to #Firefox as Google ramps up the enshitification of #Chrome, let me tell you about a killer feature for people who (a) need multiple accounts on the same websites (eg. devs) or specifically (b) have to use multiple Google accounts.

Firefox has an official addon called Multi Account Containers that lets you trivially set up color coded tabs that have separate sets of cookies. Log into your dev account in one, and your test account in another. Log into your personal #gmail in one and have another tab next to it with your work Gmail. I'm actually not signed in to any Google accounts in most my tabs, I just have containers for the specific tasks I do on Google products.

It'll take you 30 seconds to set up.

Add-on: https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers/

Mozilla's explanation: https://support.mozilla.org/en-US/kb/containers

Firefox Multi-Account Containers – Get this Extension for 🦊 Firefox (en-US)

Download Firefox Multi-Account Containers for Firefox. Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs. Cookies are separated by container, allowing you to use the web with multiple accounts and integrate Mozilla VPN for an extra layer of privacy.

@ricci I have containers in Firefox without adding any extension for it, though ..?
@dalias @ricci AFAIR it was at some point bundled into Firefox, then it became an extension.
@pmevzek @ricci Uhg, does that mean upgrading is going to nuke my containers?
@dalias @ricci OR maybe I am confusing 2 things as the FAQ at https://support.mozilla.org/en-US/kb/containers says "Are Firefox containers and Multi-account containers the same? Firefox Containers and Multi-Account Containers are complementary features that help you keep your online activities organized. While both options allow you to separate your browsing into different container tabs, the Firefox Containers feature allows you to always open new tabs in containers."
Multi-Account Containers | Firefox Help

Add Container tabs to Firefox with the Multi-Account Containers add-on, to separate your work and personal browsing.

@pmevzek @ricci Multi-Account Containers sounds sketchy (integration with their VPN partner stuff) and like it does unwanted things (automatically switching to a container context based on which site you're loading, vs locking to a context and always opening links in that container context) that harm privacy instead of preserving it.
@pmevzek @ricci Regular container tabs tho are excellent and one of the best features of Firefox.
@dalias @ricci I don't remember now why, but I had to install the extension, so anyway I live with it now. I do use the "automatically assign site X to container Y", avoids some errors, having a dozen or so containers. Anyway the logical followup would be not to have to do that and each tab/site in its own container by default, with only the possibility to "open it" to other sites/containers, but otherwise fully restricted by default.