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Is GNU General Public License v2.0 compatible with Mozilla Public License 2.0?

No

GNU General Public License v2.0 is strong copyleft; combining it into a Mozilla Public License 2.0 project would force the combined work to be GNU General Public License v2.0 (not Mozilla Public License 2.0). If your project must remain Mozilla Public License 2.0, avoid GNU General Public License v2.0 code.

About these licenses

LicenseFamilyPatent grant
GNU General Public License v2.0 (GPL-2.0) strong-copyleft No (implicit at most)
Mozilla Public License 2.0 (MPL-2.0) weak-copyleft Yes

GNU General Public License v2.0: Strong copyleft: derivative works distributed must also be GPL-2.0.

Mozilla Public License 2.0: File-level copyleft: modifications to MPL files must be MPL, but linking with non-MPL code is fine.

What to do next

If you found this page because you're trying to figure out whether shipping a particular dependency is safe, the answer above is a starting point — not a substitute for reading the actual licenses or talking to a lawyer when stakes are high.

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