I know about Workspaces recently introduced in DevTools but that is not that i need. For example: page uses jquery that is loaded from CDN, i modify jquery library code, pre
I don't know if this qualifies as an answer, but it is what I am doing, and the closer that I have get to what you want.
I load the page in the browser, and the I do save as in a local file. Note that I am saving the full page, with HTML, js and CSS.
Now, if I want to modify the a CSS, I edit the HTML and direct these file (or files) to my development files.
I reload the page, and now I can work as you want (saving and reloading what I have saved).
Of course that means that you have full access to the files, and most probably they are local, but I don't think that you are really willing to edit the real web files on line.
When I am finished modifying the files, it's just a matter of syncing my dev files with the web files .
You got most of it, but here's the slight change:
Make a change in the Styles pane (or in Sources), then click over to Sources, and when your modified file is open, hit ctrl-s.
Then you can right-click the asset in the Sources list and hit Save As... and save the new modified file to disk.
There is no way to save a modified remote file without persisting it to disk and expect it to be changed on reload.
It is possible, but quite tricky:
I use my apache in debug mode with eclipse so the cahnges are reflected to the site as soon as I save the page.