In Tor browser 7.0.7 ublock don't work if security level is set to medium or high.

To reproduce bug:

• in tor browser (onion icon) set the security level medium or high
• close tor browser
• open tor browser
• Ublock don't work properly

Problems:

• Ublock don't filter, request blocked is always zero (and you cannot see the number of filter items in ublock icon)
• if you go in list of filters and click on a filter, you cannot see the filter rules
• in register of requests, you can see only few requests