The Media Viewer cogwheel-disable option has stopped working for me recently. I have tested using Firefox and Chrome, and tested across multiple language wikis.
Expected Results:
- Using Desktop, go to a wiki where I have not yet set a local Media-Viewer opt-out.
- Go to a random article and click on an image.
- Media Viewer pops up. (Experience expected annoyance that this intrusive vampire rises from the dead every time I visit a new wiki.)
- Click the Cogwheel and click to disable Media Viewer. (Yeay, one more wiki where this vampire should stay dead.)
- The next image I click should bring up the file page.
Problem
Step 4 plays out normally with no visible problem, but it doesn't actually work. Checking the user preferences page shows that Media Viewer is still enabled. At step 5 Media Viewer is continuing to claim ownership of images.
Workaround
Click preferences link. Click appearance tab. Scroll down and manually remove the check mark from the Enable Media Viewer box. Click save. Repeat this workaround on each of hundreds of wikis.
Also please note related task T144571. Disable is broken-with-a-workaround on desktop, but Opt-Out completely fails on Mobile.