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Firefox runs my website significantly slower than IE or chrome. When I check the network tab, I see that 235ms is spent blocking. No blocking is reported for my site in chrome, and no blocking is reported in firefox for other sites, like google or amazon. It also has a much higher receiving time than chrome.
Its my understanding that blocking occurs because the browser has a limited number of connection that it can make:
What is meaning of 'Blocking' in Firebug Net Panel?
Here's an example of a website blocking before the document: http://thehill.com/ (sorry in advance for the politics). The blocking on this site doesn't always occur (it does on my site) and is about 1/10th the length of the blocking on my site.
Shouldn't the browser always have all its connections available when it tries to download the Document? Why would firefox be blocking on the document and not chrome, and how can I fix it?
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Firefox will block insecure downloads that originated from HTTPS sites soon, likely in Firefox 92, which will be released on September 7, 2021. Firefox won't download the file in this case automatically; the browser displays a warning in the download panel -- File not downloaded. Potential security risk -- with a red exclamation mark icon.
Mozilla's Firefox web browser will block the download of insecure files soon in mixed content environments. Mixed content refers to sites using secure connections and insecure connections.
Firefox 96 and older versions of Firefox displays a download prompt by default. It provides users with information about the selected file, and options to either select an application to open the file or to save it directly. The second option downloads the file immediately, unless users have changed the default configuration of the browser.
Firefox users who want more control over the downloading behavior or block automatic downloads, need to enable the "always ask you where to save files" option under Downloads in the Firefox settings to achieve that. Firefox 97 Stable is scheduled for a release on February 8, 2022.
Firefox has it's own http proxy settings. IE and chrome take proxy settings from windows settings. Please check if there is some difference between your FF and IE settings.
Next thing you can do is creating new, fresh profile in FF (make sure there is no addons installed) and trying again.
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