Firebase is one of many platforms. The original article spoke about it because the article is about Firebase. In our case, there is no specification (and using the name of a specific platform can look confusing

Please, rewrite this part with your own words. It is too similar to the original paragraph:
Using multiple environments promotes innovation: When you are working with multiple environments, your team is free to experiment on environments that are especially dedicated for this. Since there is no fear of messing with the live code, the team can use a separate environment to test out ideas and even deploy the code to a server where it can be made available to some test users who can give feedback on it, which the team can use to decide if they should implement the changes on the main codebase.

https://deploybot.com/blog/using-multiple-environments-to-improve-your-development-workflow

Please, rewrite this with your own words, it is too similar to the original:

Having multiple environments enables a team to work on parallel development efforts. If there are several people working on the app, using a different environment for each group of people helps keep the team productive.

Please, give this a second thought. It has similarities to the original:

To protect the integrity of your production data, you should limit access to it. Team members should have clearly defined roles and access rights to different parts of the system. Having multiple environments makes this possible. If you have separate development and production environments, it prevents developers from accidentally messing with or deleting production data

Please, rewrite the Using multiple environments when developing software saves time as no one has to wait on another person for shared resources, it is too similar to _Using multiple environments when developing software saves time as no one has to wait on another person for shared resources. _

Please, rewrite this using your own words. It is too similar to the Wiki article: The development environment (dev) is the environment in which changes to software are developed, most simply an individual developer's workstation. This (..) environment will include development tools like a compiler, integrated development environment, different or additional versions of libraries and support software, etc., which are not present in a user's environment.

Alternatively, the Henricodofin article has text with similarities: The development environment is the environment in which changes to software are developed, most simply an individual developer's workstation. This differs from the ultimate target environment in various ways – the target may not be a desktop computer (it may be a smartphone, embedded system, headless machine in a data center, etc.), and even if otherwise similar, the developer's environment will include development tools like a compiler, integrated development environment, different or additional versions of libraries and support software, etc., which are not present in a user's environment.

Please, rewrite this with your own words, too similar sentences can be found in the Wiki article:

The purpose of the test environment is to allow human testers to exercise new and changed code via either automated checks or non-automated techniques. After the developer accepts the new code and configurations through unit testing in the development environment, the items are moved to one or more test environments. Upon test failure, the test environment can remove the faulty code from the test platforms, contact the responsible developer, and provide detailed test and result logs.

If all tests pass, the test environment or a continuous integration framework controlling the tests can automatically promote the code to the next deployment environment.

Please, this senction too closely follows the original text from Wiki:

A stage, staging or pre-production environment is an environment for testing that exactly resembles a production environment.[7] It seeks to mirror an actual production environment as closely as possible and may connect to other production services and data, such as databases. For example, servers will be run on remote machines, rather than locally (as on a developer's workstation during dev, or on a single test machine during test), which tests the effects of networking on the system.

The primary use of a staging environment is to test all the installation/configuration/migration scripts and procedures before they're applied to a production environment. This ensures all major and minor upgrades to a production environment are completed reliably, without errors, and in a minimum of time.

Another important use of staging is performance testing, particularly load testing, as this is often sensitive to the environment.

Staging is also used by some organizations to preview new features to select customers or to validate integrations with live versions of external dependencies.

Please, rewrite this part as well. I see similarities with the WIki article, mainly in these parts:

The production environment is also known as live, particularly for servers, as it is the environment that users directly interact with. Deploying to production is the most sensitive step; it may be done by deploying ... a configuration change; deploying

Deploying a new release generally requires a restart, unless hot swapping is possible, and thus requires either an interruption in service (usual for user software, where applications are restarted) or redundancy – either restarting instances slowly behind a load balancer or starting up new servers ahead of time and then simply redirecting traffic to the new servers.