firefox-developer-tools

来源： https://stackoverflow.com/questions/59710082/how-to-set-breakpoint-on-window-close-or-prevent-the-developer-tools-window-from

来源： https://stackoverflow.com/questions/59710082/how-to-set-breakpoint-on-window-close-or-prevent-the-developer-tools-window-from

问题 I would like to know if opening browser developer tools really affect the application performance in any way. It's not about just considering opening the developer tools in the same window, it can be in a new window or the same window. Also is there any difference in application rendering/performance if developer tool is not opened vs opened state? 回答1: Yes, opening the developer tools of a browser has influence on the page's performance. This is because they observe different aspects of the

问题 I am using Firefox for development. I would like to see what CSS styles are added to A tag when I hover the mouse over it. How can I do this in Firefox? UPDATE I right-clicked on the tag and select inspect the element. I can see the styles added to the bottom right pane. However, if I move the mouse to the css pane to examine styles, then the added CSS styles disappear. I understand that I may need to break on something, but I cannot get it working. Thanks! 回答1: Right click → Inspect Element

问题 I was testing a website with the Developer Tool of Firefox and I was facing a weird bug. Then I checked the window width with a simple console log console.log($(window).width) and I saw that the reported width in developer tools wasn't the same that javascript was detecting. I tried than with the Google DevTools and showed width was consistent with the console log width. Is this a Firefox bug or am I doing something wrong? Actually on a real mobile device and on Google DevTools the website

问题 I was testing a website with the Developer Tool of Firefox and I was facing a weird bug. Then I checked the window width with a simple console log console.log($(window).width) and I saw that the reported width in developer tools wasn't the same that javascript was detecting. I tried than with the Google DevTools and showed width was consistent with the console log width. Is this a Firefox bug or am I doing something wrong? Actually on a real mobile device and on Google DevTools the website

问题 I am trying to make some changes to the Firefox Dev Tools. I am starting by adding console.log statements. Where should the output show up? What are the alternatives? How should I (attempt) to debug the Firefox Dev Tools? I have already successfully expanded omni.ja and rebuilt omni.ja from the expanded JavaScript. When I add (deliberately) bad code to the expanded JavaScript, the Firefox Dev Tools fail (which makes sense). However, when I add console.log statements, I can't find the output.

问题 I am trying to make some changes to the Firefox Dev Tools. I am starting by adding console.log statements. Where should the output show up? What are the alternatives? How should I (attempt) to debug the Firefox Dev Tools? I have already successfully expanded omni.ja and rebuilt omni.ja from the expanded JavaScript. When I add (deliberately) bad code to the expanded JavaScript, the Firefox Dev Tools fail (which makes sense). However, when I add console.log statements, I can't find the output.

问题 On Firefox 66 on Windows 10, I see the performance analysis tool in the Network tab of the Developer Tools . I click the stop watch icon to start performance analysis for the requests. But I see the pie charts greyed out and in the loading state always, no matter how long I wait. Why aren't they showing the performance metrics? Do I have to turn some setting on? 回答1: You need to refresh the Firefox. From Reset Firefox preferences to troubleshoot and fix problems Resetting preferences (zoom,

问题 I would like to observe the contents of a POST request whose successful completion results in a location.reload() - when I try to capture this request in the Network Panel of the Firefox developer tools, I find that the page reload clears the list of captured events. Can I prevent this clearing? 回答1: From Firefox 31 onwards you can use the "Enable persistent logs" setting to prevent the Network Monitor from clearing the list on reload. 回答2: Despite knowing the name for the setting is "Enable