Mozilla Public License 2.0

The GPL family of licenses are not perfect. Notably they are incompatible with
the SIL OFL 1.1 used by the fonts in scratch-render-fonts. In the packager we
'statically link' all of this those fonts into one HTML file. Is that legal?
Seems like you can make an argument that it's not. Who knows. I'm not a lawyer.

MPL 2.0 is a good alternative: It's still copyleft, used by real projects,
backed by a real organization, and GPL compatible.

Related: TurboWarp/scratch-gui#909

CONTRIBUTING.md

@@ -44,7 +44,7 @@ Extensions must be self-contained. All libraries and hardcoded resources should
 
 **We are not lawyers. This is not legal advice.**
 
-Everything in this repository must be available under an open source license. You can use any license you want, but we **STRONGLY** recommend using the [GNU Lesser General Public License version 3](licenses/GPL-3.0.txt) for all new extensions.
+Everything in this repository must be available under an open source license. You can use any license you want, but we **STRONGLY** recommend using the [Mozilla Public License verison 2.0](licenses/MPL-2.0.txt) for all new extensions.
 
 The following licenses are banned for being [incompatible the GPLv3](https://www.gnu.org/licenses/license-list.en.html), so do not use any code, images, etc. under them:
 
@@ -66,15 +66,15 @@ All extensions should need a metadata comment at the *very* start of the file, b
 // Description: Does a very cool thing. This must have punctuation at the end!
 // By: GarboMuffin <https://scratch.mit.edu/users/GarboMuffin/>
 // Original: TestMuffin
-// License: LGPL-3.0
+// License: MPL-2.0
 ```
 
 You must use line comments; block comments `/* */` will not work. These fields are **REQUIRED**:
 
  - `Name` will appear on the website. It should be similar to the name returned by getInfo().
  - `ID` should be identical to the id returned by getInfo().
  - `Description` will appear on the website.
- - `License` describes the license that the extension's code is under. It should be a valid [SPDX license](https://spdx.org/licenses/) expression. (use `LGPL-3.0` if you are unsure)
+ - `License` describes the license that the extension's code is under. It should be a valid [SPDX license](https://spdx.org/licenses/) expression. (use `MPL-2.0` if you are unsure)
 
 `By` is optionally used to credit the author of the extension (you!). `Original` is used if the extension is based on or ported from somewhere else. They both use the same format of `Name` or `Name <https://scratch.mit.edu/users/username>`. Links to places other than Scratch are not allowed at this time. You can repeat both of these as many times as needed, just add another `// By: ...` comment after.
 

README.md

@@ -10,10 +10,10 @@ See [CONTRIBUTING.md](CONTRIBUTING.md).
 
 ## License
 
-Extensions (in the `extensions` folder) will have a comment at the top of the file describing the license for the code. In the past [MIT](./licenses/MIT.txt) was the default, however now [LGPL-3.0](./licenses/LGPL-3.0.txt) is recommended. Some extensions may contain a mix of both.
+Extensions (in the `extensions` folder) will have a comment at the top of the file describing the license for the code. In the past [MIT](./licenses/MIT.txt) was the default, however now [MPL-2.0](./licenses/MPL-2.0.txt) is recommended. Some extensions may contain a mix of several.
 
 Sample projects (in the `samples` folder) are licensed under [CC-BY 4.0](./licenses/CC-BY-4.0.txt).
 
-Everything else, such as the extension images, development server, and website, are licensed under the [GNU General Public License version 3](licenses/GPL-3.0.txt).
+Everything else, such as the extension images, development server, and website are licensed under the [GNU General Public License version 3](licenses/GPL-3.0.txt).
 
 See [images/README.md](images/README.md) for attribution information for each image.