Theme Font & Size Changer

Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.
What is Theme Font & Size Changer?
Theme Font & Size Changer is an add-on which lets you adjust the font size and family within the Firefox browser interface. The changes are applied instantly and are saved permanently. It is mainly used as an accessibility aid for visually impaired people and those without perfect eyesight, but it is also useful for Firefox users with high resolution settings and wide screens.
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Add-on stats

Users: 6,776 ▲ 31
Rating: 2.21 (223)
Version: 62.1resigned1 (Last updated: 2024-04-25)
Creation date: 2010-05-28
Weekly download count: 115
Firefox on Android: Yes
Risk impact: High risk impact
Risk likelihood: Moderate risk likelihood
Manifest version: 2
Permissions:
  • tabs
  • storage
  • management
  • activeTab
  • downloads
  • contextMenus
  • <all_urls>
  • http://*/*
  • https://*/*
  • menus
    • See more
Size: 239.53K
URLs: Website

Ranking

# 972 ▼ 2
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Other platforms

Not available on Chrome
Not available on Edge
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Add-on summary

Analyze keywords

THUNDERBIRD USERS PLEASE SWITCH TO THE NEW THUNDERBIRD VERSION BY BELOW URL: https://addons.mozilla.org/en-US/firefox/addon/theme-font-size-changer-for-tb/

Theme Font & Size Changer is a simple browser tool that lets you change the font size and font family of Firefox and several other Mozilla products. It is especially valuable tool for visually impaired people and wide screen users.

Different from add-ons that enlarge and reduce text on web pages, Theme Font & Size Changer changes the font size and font family in all windows, menus, toolbars, etc within Firefox itself. All font size, font family, and other changes are applied instantly and they are saved permanently and through sessions. You may assign your favorite font into your browser interface and change its size as you wish.

It was initially created to be an accessibility aid for persons with visual impairments and for those without perfect eyesight, but it's also useful for Firefox users with high resolution settings and wide screens.

While Theme Font & Size Changer was written to be used with Firefox default theme, it does work with other non-default themes, but you may come across issues where some elements within Firefox retain the (non-default) font size setting that the theme developer chose for their theme.

There are two places that you can manage the global font size and font family of Firefox via Theme Font & Size Changer:

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User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
    Cons
    • Not working at all.
    • Mostly non functional and many features removed.
    • Cannot resize fonts as admitted by authors.
    • Is obviously no longer being developed further.
    • Latest comments on their website are from 2014.
    Most mentioned
    • Doesn't work.
    • Waste of time.
    • Has limited functionality.
    • Need for updates or discontinuation consideration.
    Recent reviews
    Not working at all. Very long manual probably outdated.
    by limex67, 2024-08-15
    by Tiarn, 2024-07-07
    by Tiarn, 2024-07-07
    View all user reviews

    Add-on safety

    Risk impact

    Theme Font & Size Changer requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

    Risk likelihood

    Theme Font & Size Changer is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

    Upgrade to see risk analysis details