I recently read an article about Firefox tweaks that would speed up page loading time by changing several settings in the about:config dialog. I knew those tweaks existed but decided to take a look if my settings were different from the ones mentioned in the article.
I found out - to my big surprise - that I was running Firefox with the default settings and not the tweaked settings. I had the feeling that Firefox was running slower than before after the latest update but I was not able to determine the cause, until now that is.
I suggest you take a look at the following settings as well and see if you are using Firefox with tweaked settings or the default ones. If the latter is the case I suppose you change the settings to the same values that I changed them to, again.
The settings must have gotten reset somehow. I'm not entirely sure if this happened during an update to a new version, through the use of an extension, or other means.
You need to open Firefox's advanced preferences dialog first:
Optimized settings have the preference set to true. Double-click it to do so. Note that while this may speed up the performance in the browser, it may cause loading issues on some servers. It is best to check this out for a while to see if you are running into issues. If you are, set the preference to false again.
After that search for browser.turbo.enabled. If no result comes up you don't have that setting yet. Right-click the blank space and select New > Boolean from the menu. Name it browser.turbo.enabled and set it to true.
If you happen to make a mistake, e.g. create a String with the name browser.turbo.enabled, you can correct it by navigating to your Firefox profile folder to edit the prefs.js file by hand. Just search for the line and delete it. Close Firefox before you edit the file as the changes won't stick if you have it running in the background.
If you are connecting to a proxy server that tunnels your traffic, then you need to modify the Network.http.proxy.pipelining preference instead. Just double-click it to set it to true.
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