Yes
Most weak-copyleft licenses (including Mozilla Public License 2.0) are designed to combine with GPL-family ones. Verify the specific weak-copyleft license version against GNU General Public License v3.0's compatibility list (FSF maintains an authoritative one).
| License | Family | Patent grant |
|---|---|---|
| Mozilla Public License 2.0 (MPL-2.0) | weak-copyleft | Yes |
| GNU General Public License v3.0 (GPL-3.0) | strong-copyleft | Yes |
Mozilla Public License 2.0: File-level copyleft: modifications to MPL files must be MPL, but linking with non-MPL code is fine.
GNU General Public License v3.0: GPLv3 adds explicit patent grant + anti-tivoisation; updated copyleft language.
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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