old_contents: import React from 'react';
  
  export default ({ options, saveOption }) => {
    const browserName = typeof chrome === 'undefined' ? 'Firefox' : 'Chrome';
  
    return (
      <fieldset className="option-group">
        <legend className="option-group__title">Miscellaneous</legend>
  
        <div className="option option_value_max-age">
          <label className="option__label" htmlFor="maxAge">Limit the action history to</label>
          {' '}
          <input className="option__element"
                 id="maxAge"
                 type="number"
                 min="2"
                 value={options.maxAge}
                 onChange={(e) => saveOption('maxAge', Number(e.target.value))}/>
          {' '}
          <label className="option__label" htmlFor="maxAge">items</label>
          <div className="option__hint">
            When the number is reached, DevTools starts removing the oldest actions. Improves the DevTools performance.
            {' '}<a href="https://github.com/zalmoxisus/redux-devtools-extension/pull/54#issuecomment-188167725">More info</a>
          </div>
        </div>
  
        <div className="option option_type_checkbox">
          <input className="option__element"
                 id="serialize"
                 type="checkbox"
                 checked={options.serialize}
                 onChange={(e) => saveOption('serialize', e.target.checked)}/>
          <label className="option__label" htmlFor="serialize">Serialize the state</label>
          <div className="option__hint">
            Recommended. Required for ImmutableJS state, optional in most other cases.
            {' '}<a href="https://github.com/zalmoxisus/redux-devtools-extension/pull/54#issuecomment-188167725">More info</a>
          </div>
        </div>
  
        <div className="option option_type_checkbox">
          <input className="option__element"
                 id="notifyErrors"
                 type="checkbox"
                 checked={options.notifyErrors}
                 onChange={(e) => saveOption('notifyErrors', e.target.checked)}/>
          <label className="option__label" htmlFor="notifyErrors">Show errors</label>
          <div className="option__hint">
            Show the {browserName} notifications when errors occur in the app
          </div>
        </div>
      </fieldset>
    );
  };
  
new_contents: import React from 'react';
  
  export default ({ options, saveOption }) => {
    const browserName = typeof chrome === 'undefined' ? 'Firefox' : 'Chrome';
  
    return (
      <fieldset className="option-group">
        <legend className="option-group__title">Miscellaneous</legend>
  
        <div className="option option_value_max-age">
          <label className="option__label" htmlFor="maxAge">Limit the action history to</label>
          {' '}
          <input className="option__element"
                 id="maxAge"
                 type="number"
                 min="2"
                 value={options.maxAge}
                 onChange={(e) => saveOption('maxAge', Number(e.target.value))}/>
          {' '}
          <label className="option__label" htmlFor="maxAge">items</label>
          <div className="option__hint">
            When the number is reached, DevTools start removing the oldest actions. Improves the DevTools performance.
            {' '}<a href="https://github.com/zalmoxisus/redux-devtools-extension/pull/54#issuecomment-188167725">More info</a>
          </div>
        </div>
  
        <div className="option option_type_checkbox">
          <input className="option__element"
                 id="serialize"
                 type="checkbox"
                 checked={options.serialize}
                 onChange={(e) => saveOption('serialize', e.target.checked)}/>
          <label className="option__label" htmlFor="serialize">Serialize the state</label>
          <div className="option__hint">
            Recommended. Required for ImmutableJS state, optional in most other cases.
            {' '}<a href="https://github.com/zalmoxisus/redux-devtools-extension/pull/54#issuecomment-188167725">More info</a>
          </div>
        </div>
  
        <div className="option option_type_checkbox">
          <input className="option__element"
                 id="notifyErrors"
                 type="checkbox"
                 checked={options.notifyErrors}
                 onChange={(e) => saveOption('notifyErrors', e.target.checked)}/>
          <label className="option__label" htmlFor="notifyErrors">Show errors</label>
          <div className="option__hint">
            Show the {browserName} notifications when errors occur in the app
          </div>
        </div>
      </fieldset>
    );
  };
  
subject: Make “DevTools” plural