Does not work with FF 57

[bachware]

VSW does not work with today's new FF57 (Quantum), because Mozilla now requires add-ons to be signed. I desperately need this for development speed/ease. Please update it ASAP, David. I've paid for it. Thanks & ciao!

[dafi]

I suppose VSW doesn't work anymore due to the new multiprocess architecture, fixing it is almost impossible

[dpat57]

That is bad news, ViewSourceWith was an extremely useful and much-appreciated utility. Firefox finally fixes its not responding problem but kills my productivity by deactivating my most-used add-ons, ugh.

Added: found a workaround that allows me to edit web page content via right-click + select View Page Source, I hope this isn't rude to mention it here:
https://support.mozilla.org/en-US/questions/757430

[dafi]

Honestly I'm very angry but radical modifications require to rewrite 90% of code and many things are no longer possible with new add-ons programming model

[bachware]

Yes. I agree with the anger.  Mozilla felt they had to do what they did in order to keep control over add-ons' vulnerabilities, also to improve performance in order to remain competitive with other browsers, and in the process, users are thrown under the bus. Still, it's typical of development headaches with legacy add-ons. At least I can still have the VSW functionality by hacking via about:config, which is analogous to hacking Windows itself by using Regedit, also often necessary.  Unfortunately, the not-so-technically adept are left helpless. A similar problem is Mozilla's impending abandonment of Thunderbird (it's already a stepchild), which is, IMHO, the most versatile and best E-mail client out there. Still, the new Quantum browser seems much faster, and has a much smaller memory footprint.

[FrankConijn]

What I like most about VSW is that I get a list of CSS and JS files used on a webpage with the click of button. Which I can then review with one click as well. Does anyone know a method so that I can do that in Quantum without VSW?