>>> My Info: Win7_64, Nightly 49, 32bit, ID 20160526082509 STR_1: 1. Open new tab, open console (Ctrl+Shift+K), dock it to the bottom side of window. Don't select any other tab in toolbox opened in Step 1. Steps listed below refer to browser toolbox 2. Open browser toolbox -> debugger (to work around another bug), open browser toolbox -> inspector 3. Inspect close button (element "#toolbox-close") placed inside devtools toolbox opened in Step 1 4. Click (ev) button in markup near the node from Step 3 5. Click "Open in debugger" button near event listener "command" saying ".../toolbox.js:2051" AR: Browser toolbox switched to debugger tab, but irrelevant script is selected ER: Script from Step 5 should be opened at said line I also tried this with other elements, see the table below. I'd like to say that it only happens with elements in devtools toolbox, which have specified line in event listener, but it should be checked. Element | event | script, line | result ------------------------------------------------------------------------------------------------------ "#propertyContainer" in computed view | copy | ".../computed.js:704" | fail "#toolbox-close" in devtools toolbox | command | ".../toolbox.js:2051" | fail "#inspector-pane-toggle" in inspector | mousedown | ".../inspector-panel.js:1042" | fail "#inspector-searchbox" in inspector | input | ".../inspector-search.js:497" | fail "#inspector-element-add-button" | command | ".../inspector.xul" | success "#back-button" in urlbar | mousedown | ".../browser.js:322" | success