## What were you doing? 1. Install [Tree Style Tab](https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/) 2. Open about:debugging 3. Inspect Tree Style Tab 4. Open Debugger 5. Try and set a breakpoint anywhere ## What happened? All line numbers in the debugger de-emphasised to indicate no breakpoints available & can't set one anywhere. ## What should have happened? Some line numbers highlighted, able to create breakpoints. ## Anything else we should know? This was [reported by a user in #firefox](https://mozilla.logbot.info/firefox/20190907#c16598017) >$ mozregression --good 69 -e ~/Downloads/Software/tree_style_tab-3.1.7-fx.xpi -a "about:debugging" >[...] >16:24.21 INFO: Last good revision: 8637163553058a09e835ee6d8e53a09735b1b1ec >16:24.21 INFO: First bad revision: efe4a620841ca7032485544176fb051a642c01bc >16:24.21 INFO: Pushlog: >https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=8637163553058a09e835ee6d8e53a09735b1b1ec&tochange=efe4a620841ca7032485544176fb051a642c01bc ```
Bug 1579654 Comment 0 Edit History
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## What were you doing? 1. Install [Tree Style Tab](https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/) 2. Open about:debugging 3. Inspect Tree Style Tab 4. Open Debugger 5. Try and set a breakpoint anywhere ## What happened? All line numbers in the debugger de-emphasised to indicate no breakpoints available & can't set one anywhere. ## What should have happened? Some line numbers highlighted, able to create breakpoints. ## Anything else we should know? This was [reported by a user in #firefox](https://mozilla.logbot.info/firefox/20190907#c16598017) >$ mozregression --good 69 -e ~/Downloads/Software/tree_style_tab-3.1.7-fx.xpi -a "about:debugging" >[...] >16:24.21 INFO: Last good revision: 8637163553058a09e835ee6d8e53a09735b1b1ec >16:24.21 INFO: First bad revision: efe4a620841ca7032485544176fb051a642c01bc >16:24.21 INFO: Pushlog: >https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=8637163553058a09e835ee6d8e53a09735b1b1ec&tochange=efe4a620841ca7032485544176fb051a642c01bc