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
```
## 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

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