Firefox desktop · Research guidance. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Identify what needs enlargement
A programme description can be unreadable while its poster and player are already large enough. Firefox offers text-only zoom and a minimum font size as alternatives to enlarging everything. Decide whether the problem is one page’s text or consistently tiny text across several pages. This keeps the adjustment matched to the actual reading task.
Try text-only zoom
Mozilla documents View, Zoom, Zoom Text Only in the traditional menu. On suitable desktop systems, the Alt key temporarily reveals that menu. Once text-only mode is selected, the zoom controls affect text rather than images. Make a small change and inspect the result in the actual programme description or menu you need to read.
Review a minimum where appropriate
Firefox’s font settings include an Advanced area with Minimum Font Size. The settings panel names can vary between releases, so use the current Accessibility or Language and Appearance area shown in Firefox. Choose a modest minimum and review a page that previously used small text. This is a broader font preference than a one-page zoom change.
Check for layout side effects
Mozilla warns that changed text sizes or minimum fonts can cause some pages to display incorrectly. Check whether buttons overlap, labels are cut off or information moves below the visible area. Keep the previous choice available and reduce or restore it if the reading benefit is outweighed by inaccessible controls.
Keep captions separate
Text rendered by a custom player or a programme’s caption system may have its own appearance controls. A Firefox text preference should not be promised to restyle every subtitle. Record which page labels changed and which text did not; that makes the next accessibility question precise without resetting unrelated player or account settings.
Questions, answered
Does text-only zoom enlarge poster images too?
Its documented purpose is to change text rather than images.
Can a minimum font size affect layout?
Yes. Mozilla advises checking for display problems after changing it.