Using only a few (note: literally 5) extensions. Installed on WebKit. I can make them all disappear at will just by closing and restarting WebKit. An easily reproducible that needs to be addressed.. note: my first bug report on here, any feedback is welcome.
Thank you for the report! Which versions of macOS and Safari do you have?
MacOS 10.12.4 Safari 10.1
<rdar://problem/31335578>
Thanks, can only hope this is fixed sooner rather than later as Safari 10.1 is very unstable (In reply to Radar WebKit Bug Importer from comment #3) > <rdar://problem/31335578>
*** Bug 170634 has been marked as a duplicate of this bug. ***