Recent answers to Firefox very slow after refresh or re-install .https://support.mozilla.org/lt/questions/12707712019-11-06T19:49:53-08:00FF 69 upgraded to FF 70; Win 7 Home Premium; Avast Free AV 19.8.2393 (build 19.8.4793.541); no FF Ad2019-11-06T19:49:53-08:00martin.underwood464https://support.mozilla.org/lt/questions/1270771#answer-1265057<p><strong>FF 69 upgraded to FF 70; Win 7 Home Premium; Avast Free AV 19.8.2393 (build 19.8.4793.541); no FF Add-Ons</strong>
</p><p>When my PC upgraded (automatically) from FF 69 to FF 70 I started to get this symptom: when the first instance of FF was started, there was a delay of about 15 seconds between the FF window (incl button and bookmark bars) appearing and the page opening.
</p><p>Additionally, for the BBC News page <a href="http://www.bbc.co.uk/news" rel="nofollow">www.bbc.co.uk/news</a> (which is my Home Page), I got an error
</p><p><em>Secure Connection Failed
</em>
</p><p><em>An error occurred during a connection to <a href="http://www.bbc.co.uk" rel="nofollow">www.bbc.co.uk</a>. PR_END_OF_FILE_ERROR
</em>
</p><p><em>The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.</em>
</p><p>If I press "Reload" on that error page, the web page loads fine.
</p><p>The problem only affected the first page to be loaded (all subsequent pages load fine) and did not affect a second instance of FF that was subsequently opened.
</p><p>I tried:
</p>
<ul><li> refresh profile (create a new one)
</li><li> run FF in safe mode
</li><li> start Win 7 in safe mode
</li><li> disable Shields Control in Avast
</li></ul>
<p>but to no avail.
</p><p><a href="https://www.reddit.com/r/firefox/comments/dnp469/firefox_70_upgrade_cause_first_webpage_to_load/" rel="nofollow">https://www.reddit.com/r/firefox/comments/dnp469/firefox_70_upgrade_cause_first_webpage_to_load/</a>
</p><p>reports an interaction between FF 70 and Avast, with a registry fix
</p><p>HKEY_LOCAL_MACHINE/Software/Policies/Mozilla/Firefox/Certificates
</p><p>change ImportEnterpriseRoots from 1 to 0
</p><p>Which works for me, but there is the warning that the key may spontaneously revert to 1.
</p>It was the New Tab Homepage add-on that was causing it. I've removed it and replaced it with New tab2019-10-22T17:48:35-07:00rfm1951https://support.mozilla.org/lt/questions/1270771#answer-1260236<p>It was the New Tab Homepage add-on that was causing it. I've removed it and replaced it with New tab Override and all's well now.
</p><p>In fact it's never been so fast. Clearly I've had an issue for some time without realising. It wasn't until it became so slow it was virtually unusable that I took any action. I can't believe how fast it is now.
</p><p>Thanks to those who offered assistance, much appreciated.
</p>Thanks cor-el but it looks like it was a couple of add-ons getting in each others way. I've disabled2019-10-18T04:23:30-07:00rfm1951https://support.mozilla.org/lt/questions/1270771#answer-1259444<p>Thanks cor-el but it looks like it was a couple of add-ons getting in each others way. I've disabled them and, for now at least, it's solved the problem.
</p>Boot the computer in Windows Safe mode with network support to see if that has effect in case securi2019-10-17T06:32:25-07:00cor-elhttps://support.mozilla.org/lt/questions/1270771#answer-1259319<p>Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.
</p>
<ul><li><a href="https://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/" rel="nofollow">https://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/</a>
</li><li><a href="https://www.7tutorials.com/4-ways-boot-safe-mode-windows-10" rel="nofollow">https://www.7tutorials.com/4-ways-boot-safe-mode-windows-10</a>
</li></ul>You mentioned that the problem doesn't occur until you get all add-ons installed.
Take a closer look2019-10-17T05:21:14-07:00user104147805413306348376805769878442569366https://support.mozilla.org/lt/questions/1270771#answer-1259305<p>You mentioned that the problem doesn't occur until you get all add-ons installed.
Take a closer look at New Tab Homepage, Open bookmarks in new tab and Open Link in New Tab running together.
I'm suspecting some sort of conflict there.
</p>My_Cheese_Is_Slippin' said
Hi Rod,
Looking at your System Details, the first thing that caught my 2019-10-17T05:01:57-07:00rfm1951https://support.mozilla.org/lt/questions/1270771#answer-1259299<p><em>My_Cheese_Is_Slippin' <a href="#answer-1259218" rel="nofollow">said</a></em>
</p>
<blockquote>
Hi Rod,
Looking at your System Details, the first thing that caught my eye is the four-year-old graphics driver.
Try updating the driver to see if that helps and get back to us.
Here is a link to AMD Support:
<a href="https://www.amd.com/en/support" rel="nofollow">https://www.amd.com/en/support</a>
</blockquote>
<p>Thanks but the latest driver is still nearly 4 years old! Nevertheless, I've installed the latest version but it doesn't seem to have made any difference at this stage.
</p>Hi Rod,
Looking at your System Details, the first thing that caught my eye is the four-year-old grap2019-10-16T18:26:23-07:00user104147805413306348376805769878442569366https://support.mozilla.org/lt/questions/1270771#answer-1259218<p>Hi Rod,
Looking at your System Details, the first thing that caught my eye is the four-year-old graphics driver.
Try updating the driver to see if that helps and get back to us.
</p><p>Here is a link to AMD Support:
<a href="https://www.amd.com/en/support" rel="nofollow">https://www.amd.com/en/support</a>
</p>