Experience vs. Convention in Popper's Methodology

As a realist and an empiricist Popper attacks conventionalism, and in his critical and objectivist conception of science he rejects foundationalism. But steering away from both extremes proves difficult, and Popper’s methodology seems to lean dangerously toward the former. This is only appearance, however, for his methodological rules succeed in providing science with empirical (though neither subjective nor infallible) foundations.