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Unable to use tumblr dashboard properly?

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Up until waking this morning I was able to fully use tumblr and the dashboard correctly. Unfortunately that is no longer the case. When I go to tumblr I encounter a whole plethora of issues that make using it almost impossible. On the dashboard and pages with it enabled, endless scroll no longer works. None of the posting options or the ability to repost load once clicked, it just throws up the transparent blue without the tool. I cannot get the drop-down for followed tags to appear. I can't even change which blog of my own I'm viewing.

So far I have tried the following:Safe Mode-I encountered no problems in safe-mode. Resetting Firefox-I thought if I removed all extensions and things it might fix it, sadly it did not. Disabling extensions one by one-Did so with them all, no change. Using a different browser-Everything works fine in Chrome, but I refuse to use it because I view pages using advanced fonts and Chrome doesn't support them. I've contacted support@tumblr.com, but have received no reply, and it does mostly seem to be a browser-side issue.

Up until waking this morning I was able to fully use tumblr and the dashboard correctly. Unfortunately that is no longer the case. When I go to tumblr I encounter a whole plethora of issues that make using it almost impossible. On the dashboard and pages with it enabled, endless scroll no longer works. None of the posting options or the ability to repost load once clicked, it just throws up the transparent blue without the tool. I cannot get the drop-down for followed tags to appear. I can't even change which blog of my own I'm viewing. So far I have tried the following:Safe Mode-I encountered no problems in safe-mode. Resetting Firefox-I thought if I removed all extensions and things it might fix it, sadly it did not. Disabling extensions one by one-Did so with them all, no change. Using a different browser-Everything works fine in Chrome, but I refuse to use it because I view pages using advanced fonts and Chrome doesn't support them. I've contacted support@tumblr.com, but have received no reply, and it does mostly seem to be a browser-side issue.

Chosen solution

Firefox's Safe Mode makes a few other changes in addition to disabling extensions. These include disabling Firefox's use of hardware acceleration (already not used on your system, based on your More System Details) and turning off the JavaScript compilers (JavaScript still runs, but through a slower pathway). Not sure whether disabling those compilers would help.

It does sound like some essential script files are not running, or maybe not even loading...

Of your listed extensions, I would be most suspicious of HTTPS-Everywhere. If you force HTTPS on a site not designed for it, missing content can happen. Often this would be indicated by a mixed active content blocking icon in the address bar (shield icon) to the left of the URL. If you see that, check out this article for more information: Mixed content blocking in Firefox

(When I try to access https://www.tumblr.com/dashboard it redirects back to http://www.tumblr.com/dashboard as though it's not supposed to be accessed that way.)

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Chosen Solution

Firefox's Safe Mode makes a few other changes in addition to disabling extensions. These include disabling Firefox's use of hardware acceleration (already not used on your system, based on your More System Details) and turning off the JavaScript compilers (JavaScript still runs, but through a slower pathway). Not sure whether disabling those compilers would help.

It does sound like some essential script files are not running, or maybe not even loading...

Of your listed extensions, I would be most suspicious of HTTPS-Everywhere. If you force HTTPS on a site not designed for it, missing content can happen. Often this would be indicated by a mixed active content blocking icon in the address bar (shield icon) to the left of the URL. If you see that, check out this article for more information: Mixed content blocking in Firefox

(When I try to access https://www.tumblr.com/dashboard it redirects back to http://www.tumblr.com/dashboard as though it's not supposed to be accessed that way.)

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I disabled HTTPS-Everywhere on Tumblr and it seems to be working. One of the portions (Quantcast) of viewing the page has probably lost it's certificate which the program mostly checks for. I'm shocked that when I disabled HTTPS-Everywhere earlier it didn't change anything.