Author Topic: Avast preventing .png & .svg images from displaying in Wikipedia articles/pages.  (Read 3567 times)

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  • Guest
Recently (probably beginning within days ago) I began to realize that my Mozilla Firefox (current ver. 39.0) browser is no longer displaying .png & .svg images (.jpg images isn't affected whatsoever) in Wikipedia articles or pages even when it is running in safe mode. However, strangely enough, Wikipedia articles or pages loaded just fine in Internet Explorer thus eliminating the issue being server-side. Attempted to reset the Mozilla Firefox browser and manually clearing away all cache and cookies even though I'm always private browsing permanently anyway but the issue persisted.

So after some diagnostic and troubleshooting, I believed I might have isolated the fault to Avast Internet Security (current ver. 10.3.2225) as Wikipedia articles or pages loaded fine with it being disabled. Is there any reason why this peculiar issue should be happening in Mozilla Firefox only, considering the configurations and setting has been as it is for months since the last time time I went through them, and most importantly, how do I resolve this?

Any help at all is deeply appreciated and a thank you in advance!
« Last Edit: July 29, 2015, 11:07:56 AM by 283841465 »


  • Guest
It has been quite a while now (approximately 14 days) since this thread was initially submitted, does no one in here has any idea what is happening between Avast and Wikipedia or has a solution in mind?

Though I do have to apologise first of all as English isn't my first nor native language and if any of you have found it somehow difficult to understand me, I'm sorry. So to reiterate in simpler form...

Problem or Issue Encountered

01. Mozilla Firefox no longer display .gif, .png & .svg images (.jpg images isn't affected) in Wikipedia articles or pages even when it is running in safe mode without any add-ons and plugins installed whatsoever, all browsing data including cache and cookies has been cleared thoroughly beforehand.

  • Internet Explorer loaded Wikipedia articles or pages just fine.
  • Mozilla Firefox loaded Wikipedia articles or pages just fine when Avast Internet Security is disabled.
  • No significant changes to both hardware or software configurations and settings for the past several months.

Case Exhibit 01

Case Exhibit 02

Case Exhibit 03

Any help at all in resolving this is deeply appreciated and a big thank you in advance!
« Last Edit: August 11, 2015, 12:41:03 PM by 283841465 »

Online bob3160

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See if this helps:

Free avast! Security Seminar:  -  Important: -- My Web Site: - Win 11 Pro v21H2 64bit, 16 Gig Ram, 1TB SSD, Avast Free 22.5, How to Successfully Install Avast & Clean Install -- My Online Activity https://

Offline NON

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For me there is no problem with Firefox and Avast.
Main: Win10 Pro 21H2 64bit / Core i5-7400 3.0GHz / 16GB RAM / Avast 22 Premium Beta(Icarus) / Comodo Firewall (testing again)
Mobile: Win10 Pro 21H1 64bit / Core i5-3340M 2.7GHz / 8GB RAM / Avast 21 Free / Windows Firewall Control

Avast の設定について解説しています。よろしければご覧ください。


  • Guest
I had the same issue, here is my thread, it happened with both FireFox and Chrome

Currently I don't know which av to use. Bit defender stops my computer from turning off, AVG freezes my computer, and avast blocks wiki image, lol, just damn it, why all of them???

I will reinstall avast and try to disable that https scanning to see will it work.


  • Guest
Additional info: it does not happen with older version, 10.2.2218, but from 10.3.2225, so there is a clue.

Offline DavidR

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No problem for me on 10.3.2225 and FF 39.0.3 & FF 40.0.

The only difference from 10.2.2218 to 10.3.2223 (earliest build of avast 2015 R3) was the inclusion of HTTPS scanning. So disabling that as suggested by Bob may help.

What Operating System and service pack are you using ?
Windows 10 Home 64bit/ Acer Aspire F15/ Intel Core i5 7200U 2.5GHz, 8GB DDR4 memory, 256GB SSD, 1TB HDD/ avast! free 22.5.6015 (build 22.5.7263.730) UI 1.0.711/ Firefox, uBlock Origin, uMatrix/ MailWasher Pro/ Avast! Mobile Security


  • Guest
picture are on https , so it's same problem than other thread :

And no real answer from avast othen than " disable https scan " ...