Created attachment 8940938 [details] CookiesDialog-removeSelectedCookies.PNG Steps to reproduce: 1. Launch Nightly 2. Open about:preferences#privacy > Go to History 3. Select "Use custom settings for history" 4. Click [Show Cookies...] button 5. If there are any cookies... 5-1. Remove all cookies -> [Remove Selected] button will be disabled 5-2. Close dialog 5-3. Click [Show Cookies...] button Actual results: [Remove Selected] button is enable even if no cookie selected. "TypeError: item is null" occur if click it. TypeError: item is null cookies.js:644:1 Expected results: Disable [Remove Selected] button if no cookie selected.
Has STR: --- → yes
status-firefox57: --- → wontfix
status-firefox58: --- → affected
status-firefox-esr52: --- → wontfix
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