I have the same issue. If I press 'continue', this message pops up. It looks like a form to fill in: Awesome Screenshot Options Image Format PNG JPG Shortcuts Setting Capture Visible Capture Full

So I am assuming this is something to do with the online GIF maker I used a few days ago, when the issues started. Gickr.com?

I've been having this happen to me every time I go to Tumblr.com. The first time I go there after opening Firefox, it'll at least give me the option to stop the script. The next time I accidentally go to Tumblr in the same session, it'll just freeze and I have to kill the process.

Just thought I'd reply saying where I have the issue. That's the only site that I go to where it freezes up like this, though.

Edit - I had the Missing e add-on and disabled it in an attempt to get it to work, and it did. But I still have this weird issue where it says I need Javascript to view the site, and I do have it installed (and updated) but...uh? Different issue I guess.

I started having this problem after Tumblr.com changed the way it displayed tags on my dashboard. The updated version of Missing e (released today) has fixed this problem for me!

EDIT: I messaged the Missing e developer about this error, and he sent back this: "The error was related to the maximum font size feature, which is no longer necessary and has been removed from Missing e."

I don't use Gickr or Tumblr. I don't know what missing e means.

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode

• https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

I haven't solved my issue yet but I know now that it does not happen in safe mode. It is a good start. Thanks for your help

If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.

• Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
• Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")