I am running Firefox 57.0.4 (64-bit) and cannot see the zoom control buttons (+/-) in IFlightplanner.com. They checked and claim it is a browser issue.
The labels on the zoom radio buttons are missing. A screen print is enclosed as a WordPad document.
Solution choisie
The "shield" icon next to the "i-in-a-circle" at the left end of the address bar indicates that some content in the page is being blocked by the Tracking Protection feature. It would be strange for such blocking to affect only two buttons, but maybe it also affects other items that we can't see (because they're blocked). You can click the shield to create an exception for the page. This article has more information on this feature: What happened to Tracking Protection?.
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Sorry, the site does not allow Wordpad (or other kinds of document) attachments. Instead of pasting into Wordpad, can you paste into the Paint program and save as a PNG image? You can attach PNG or JPG files to a reply.
https://support.mozilla.org/questions/1201061#question-reply
I should link to our more general articles:
Note horizontal radio buttons at top right display labels. Vertical buttons on lower right do not....
Went to the same site and I got the zoom feature showing and the little figure showing there as well. So are you sure your not using some adblocker or aggressive A/V program?
The reply is somewhat helpful. Note that some radio button display and some do not. So if an adblocker or a/v program is running it should affect all buttons? There is no a/v program running. As best I can tell there is no adblocker running. There is something unique about how this site is handled because the same zoom radio buttons display correctly on Google maps. That is why I don't know where to look for whatever is inhibiting these two button from displaying their labels.
Solution choisie
The "shield" icon next to the "i-in-a-circle" at the left end of the address bar indicates that some content in the page is being blocked by the Tracking Protection feature. It would be strange for such blocking to affect only two buttons, but maybe it also affects other items that we can't see (because they're blocked). You can click the shield to create an exception for the page. This article has more information on this feature: What happened to Tracking Protection?.
Typicaly when you set flags on an element's display properties it applies to all elements within a group. Apparently, as you indicated only some controls had their labels blocked. While the labels were blocked, the functionality of the radio button was fully operational. To block the label but not the functionality of the button is probably a bug.
Anyways, thanks for finding a cure. The zoom features are now labeled.