I have been using owl for a few years now. I some fairly severe visual problems, to the point where if I didn't have this extension, I wouldn't be able to consistently use a computer. So I definitely really like this extension, but after upgrading to firefox 58, I have had some problems.
After upgrading to firefox 58, it seems that owl is ignoring the settings for which sites I have enabled the classic theme and for which sites I have disabled owl. Looking at my settings, the settings page for owl in fact indicates that owl is disabled on page "x", but when I go to page "x" owl will not be disabled. Same thing happens for the classic theme settings.
I am not sure why this is happening. Perhaps firefox 58 changed something in the web extensions api?
I really enjoy this extension and would like to see it return to how things were before firefox 58. Please let me know if you need any information from me to help debug this issue. Thank you.
Also, as a side issue, ever since the web extensions version of owl, I no longer have the settings panel, just a button that toggles owl on and off? Was the panel removed?