There are a couple of things you can do if a web browser starts to slow down, either on start up which may take longer than usual or when you are working with it on your system. A simple restart may help you out right away, although it may sometimes take more than that to resolve the issue. I have published a guide that explains in detail what you can do if Firefox seems to be too slow. The guide mentions important aspects such as updating the browser to the latest version, disabling unneeded plugins and add-ons, or using the browser's reset feature as a last resort to get things in order again.
Mozilla apparently has added a new feature to Nightly versions of the browser that may help users if the Firefox startup is slower than usual, or slower than average. Nightly versions of Firefox are cutting edge versions that receive new features first before they make their way into aurora, beta and then stable versions of the web browser.
New versions of Firefox record the startup time of the browser and compute an average start up time. The average is then compared to a threshold and if if exceeds it, the slow startup notification is displayed at the bottom of the screen.
Firefox seems slow... to... start.
Learn How to Speed it Up
Don't Tell Me Again
The learn to speed it up button leads to this Mozilla Support page that addresses common start up issues. Discussed here are the following topics:
A common issue that can slow down the start up significantly is if the home page or a page that is restored during session restore is not responding correctly. The second button disables the checks so that you won't be notified again.
As far as technicalities go: Firefox uses the average load time of the last five sessions and compares it with the current one. The message is displayed if the average startup time is greater than 1 minute, the current threshold.
This is a basic addition to Firefox which basically points users to the support page on the Mozilla website so that they can read through it to see if any of the suggested fixes speeds up the browser. It is probably nothing that experienced users can take advantage of as they know what to do if the browser is taking a long time to load.
I would have preferred a direct response to the issue, e.g. a link to the extensions listing or plugin listing like Microsoft does when it notices that Internet Explorer is slower than usual. (via Browserfame)
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