I tried to install the extension using composer on my project which is Magento 2.1.7 CE.
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Conclusion: don't install firebear/importexportfree 1.0.3
- Conclusion: don't install firebear/importexportfree 1.0.2
- Conclusion: don't install firebear/importexportfree 1.0.0
- Conclusion: don't install firebear/importexportfree 1.0.3
- Conclusion: don't install firebear/importexportfree 1.0.2
- Conclusion: don't install firebear/importexportfree 1.0.0|remove magento/framework 100.1.7
- Conclusion: don't install firebear/importexportfree 1.0.0|don't install magento/framework 100.1.7
- Installation request for firebear/importexportfree ^1.0 -> satisfiable by firebear/importexportfree[1.0.0, 1.0.2, 1.0.3].
- firebear/importexportfree 1.0.0 requires magento/module-import-export 100.0.* -> satisfiable by magento/module-import-export[100.0.2, 100.0.3, 100.0.4, 100.0.5, 100.0.6, 100.0.7].
- magento/module-import-export 100.0.2 requires magento/framework 100.0.* -> satisfiable by magento/framework[100.0.2, 100.0.3, 100.0.4, 100.0.5, 100.0.6, 100.0.7, 100.0.8, 100.0.9, 100.0.10, 100.0.11, 100.0.12, 100.0.13, 100.0.14, 100.0.15, 100.0.16].
- magento/module-import-export 100.0.3 requires magento/framework 100.0.* -> satisfiable by magento/framework[100.0.2, 100.0.3, 100.0.4, 100.0.5, 100.0.6, 100.0.7, 100.0.8, 100.0.9, 100.0.10, 100.0.11, 100.0.12, 100.0.13, 100.0.14, 100.0.15, 100.0.16].
- magento/module-import-export 100.0.4 requires magento/framework 100.0.* -> satisfiable by magento/framework[100.0.2, 100.0.3, 100.0.4, 100.0.5, 100.0.6, 100.0.7, 100.0.8, 100.0.9, 100.0.10, 100.0.11, 100.0.12, 100.0.13, 100.0.14, 100.0.15, 100.0.16].
- magento/module-import-export 100.0.5 requires magento/framework 100.0.* -> satisfiable by magento/framework[100.0.2, 100.0.3, 100.0.4, 100.0.5, 100.0.6, 100.0.7, 100.0.8, 100.0.9, 100.0.10, 100.0.11, 100.0.12, 100.0.13, 100.0.14, 100.0.15, 100.0.16].
- magento/module-import-export 100.0.6 requires magento/framework 100.0.* -> satisfiable by magento/framework[100.0.2, 100.0.3, 100.0.4, 100.0.5, 100.0.6, 100.0.7, 100.0.8, 100.0.9, 100.0.10, 100.0.11, 100.0.12, 100.0.13, 100.0.14, 100.0.15, 100.0.16].
- magento/module-import-export 100.0.7 requires magento/framework 100.0.* -> satisfiable by magento/framework[100.0.2, 100.0.3, 100.0.4, 100.0.5, 100.0.6, 100.0.7, 100.0.8, 100.0.9, 100.0.10, 100.0.11, 100.0.12, 100.0.13, 100.0.14, 100.0.15, 100.0.16].
- Can only install one of: magento/framework[100.1.7, 100.0.2].
- Can only install one of: magento/framework[100.1.7, 100.0.3].
- Can only install one of: magento/framework[100.1.7, 100.0.4].
- Can only install one of: magento/framework[100.1.7, 100.0.5].
- Can only install one of: magento/framework[100.1.7, 100.0.6].
- Can only install one of: magento/framework[100.1.7, 100.0.7].
- Can only install one of: magento/framework[100.1.7, 100.0.8].
- Can only install one of: magento/framework[100.1.7, 100.0.9].
- Can only install one of: magento/framework[100.1.7, 100.0.10].
- Can only install one of: magento/framework[100.1.7, 100.0.11].
- Can only install one of: magento/framework[100.1.7, 100.0.12].
- Can only install one of: magento/framework[100.1.7, 100.0.13].
- Can only install one of: magento/framework[100.1.7, 100.0.14].
- Can only install one of: magento/framework[100.1.7, 100.0.15].
- Can only install one of: magento/framework[100.1.7, 100.0.16].
- Installation request for magento/framework (locked at 100.1.7) -> satisfiable by magento/framework[100.1.7].