Describe the issue

When selecting the zapper or the picker in the ublock window, the current page become unresponsive

One or more specific URLs where the issue occurs

This happens with any web page.

Screenshot in which the issue can be seen

The page display is unaffected, it does not become dark, no element can be selected, the element selection window does not show, and no hyperlink can be clicked. Page reloading is required to get back to normal.

Steps for anyone to reproduce the issue

1. install ublock origin
2. click on the ublock origin red icon
3. select picker or zapper mode, the display does not change
4. click anywhere in the page, nothing happens, links are not clickable anymore

Note: ublock origin still works since some URLs are reported blocked.

Your settings

• OS/version: windows 10 64-bit

• OS/version: linux mint 18.2 64-bit also has the same problem

• Browser/version: Firefox 56.0 64 bits

• Browser/version: Firefox 55.0.3 32 bits (same behaviour as Fx 56)

• uBlock Origin version: v1.14.11rc10 (last release has the same problem)

• ublock origin settings are unchanged from defaults

Your filter lists

Unchanged default selections

Your custom filters (if any)

None