Hi everyone, Tl;dr: Please help us with testing/feedback on Firefox DevTools after we fixed long-standing performance & quality issues in Firefox’s JavaScript debugging capabilities.
During Firefox development, from platform to frontend to web compat, JavaScript debugging is a key aspect and needs to be rock solid. Responding to your feedback, we (the Firefox DevTools team) have put in tremendous effort to make all aspects of the Debugger more reliable, faster and convenient. Firefox 67 and 68 is where a lot of this work comes together: # 1. Debug workers within the debugger without a new toolbox Fast web applications depend on concurrency, but DevTools’ worker support has been clunky at best. Now you can switch between workers in a new Debugger panel and see their source files along the other sources – all in the Debugger without opening a new toolbox. # 2. Set breakpoints on lines and columns (aka Column/Inline Breakpoints) Pausing on columns, not just lines, provides much needed accuracy for pausing in the right locations and into minified code. To make this work we refactored all aspects of how pausing locations are determined and used; with a focus on performance and reliability. # 3. Set breakpoints to log messages (aka LogPoints) Lets you switch breakpoints to print message and variables to the Console instead of pausing code execution. This can give you superpowers for tricky situations, like when pausing would break the test case or where source code can’t be edited. # 4. Significantly improved quality for breakpoints, stepping & overall performance We have been burning through a backlog of long-standing issues that made debugging feel flaky and slow in some situations. No more losing breakpoints, stepping into wrong functions! Meanwhile our source maps, the glue that makes modern web apps debuggable, took over other devtools. We will keep honing the foundations of the debugger, making it more reliable and faster with every release. Those changes touched major parts of the server and frontend. We need your help now with testing the Debugger against your projects, Firefox, extension, or web, and providing feedback! Even if you find an issue that you experienced in the past, please don’t hesitate to bring it to our attention. File bugs: https://bugzilla.mozilla.org/enter_bug.cgi?product=DevTools&component=Debugger Recording a performance issue: https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Reporting_a_Performance_Problem Join us in Slack/IRC: #devtools Read more in our hacks article: https://hacks.mozilla.org/2019/05/faster-smarter-javascript-debugging-in-firefox/ Thank you for your continued support to improve the experience for the web's creators, Harald on behalf of Firefox DevTools team! p.s. Special thanks to Jason Laster, Logan Smyth, David Walsh, Brian Hacket, Jan Honza Odvarko, Nicolas Chevobbe, Anshul Malik, Hubert Boma Manilla _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
