Dictionaries
The dictionaries extension would've worked similarly to the dictionary values in Python, where you could assign different variables in a list to different numbers or values. While there was not anything fundimentally wrong with the extension, GarboMuffin was not accepting custom extensions to TurboWarp at the time. In the case that someone makes a similar extension, it would likely be accepted.
Local Storage
The Local Storage extension would've been able to save and load files from your computer like a cloud variable, without the need for consent from the user. This would've been great for save systems and fantasy OSs, however raises some very obvious security concerns. Interestingly enough, there's a currently unrejected local storage extension pull request in the system as of now, so we may be seeing something similar to this very soon.
The Twitter extension, as the name suggests, would've been able to access the Twitter API, and view tweets, profiles, and other information from the website. However, the current state of the Twitter API would make an extension like this unreliable, enough so that it isn't worth it to add this extension. This is actually the second itteration of a Twitter Extension getting shut down, the first one being a ScratchX extension.
CrazyGames
The CrazyGames extension would've been able to connect to the CrazyGames website and perform functions such as sending game invites, displaying ads, and checking for AdBlockers. Aside from CrazyGames not being open-source enough, GarboMuffin simply did not want to partner with a website made for solely commercial games, since it goes against the morals of TurboWarp.
Cookies
The Cookies extension is similar to the Local Storage extension, with the difference that Cookies would utilise browser cookies (data stored in your browser). This one was also shot down for similar reasons, since it was easily exploitable and could cause collisions between cookies (if you tried to modify the sessionid cookie or user cookies).Â
JavaScript
The JavaScript extension would've been an extension that allowed users and projects to run JavaScript within the project. This was against the extensions TOS, and was not accepted as such.
Run JavaScript
The Run JavaScript extension was made by the same user as the previous one, and modified the script to be slightly less exploitable. Although not against the TOS, it was still very exploitable, and was rejected again. In case anybody's curious, this was the last time that somebody tried to add a JavaScript extension.
Outfitted
Outfitted was an extension that allowed you to modify costumes or backdrops in the project itself. Although the extension was never officially rejected, the creator has had issues completely fool proofing the extension, and as such, GarboMuffin advised that they take some more time to bugfix. If the creator decides to return to the project, we may actually end up seeing the Outfitted extension very soon.