Signed-off-by: Gabriel Ivăncescu <gabrielopcode@gmail.com>

Signed-off-by: Gabriel Ivăncescu <gabrielopcode@gmail.com>

Signed-off-by: Gabriel Ivăncescu <gabrielopcode@gmail.com>

Gecko may return a pseudo-element-list even on error (such as with an
invalid selector, for example), which holds refs to elements and leaks.
Signed-off-by: Gabriel Ivăncescu <gabrielopcode@gmail.com>

Avoids enum casts when it's used for reader.