Right Click to a picture that you desire to associate, Open With. Then select "Other Application" (even if you see the default photo viewer there!).
Now select "Photo Viewer" and check the "Set as default" box below as you can see on this image:
trying to update my OS 0.4.1 to the latest version
The ability to easily upgrade to the new version has only been introduced in elementary OS 5.0. I believe this was also the reason behind the version numbering shift.
I don't whant to buy new license to download the 5.1 version. :)
You do not need to buy a new licence. elementary OS is free and open ...
I know this is an older post but I ran across this post while looking into my own issue and figured I would provide the solution I found.
In Chromium: After installing the "pepperflashplugin-nonfree" I was able to enable it in Chromium and access content as usual. I suspect bugs (or what have you) have been corrected since this post.
Below commands in ...
In my huble opinion just try to install firefox from app center or via terminal and use ublock origin and facebook container plugins in Firefox.
I get rid of the Epiphany in terminal
sudo apt remove --purge epiphany
sudo apt update
And installed firefox
sudo apt install firefox
Then some clean
sudo apt autoremove
By the way ...